diff --git a/packages/flutter/lib/src/material/stepper.dart b/packages/flutter/lib/src/material/stepper.dart
index 62178c8d7b..267716e6d2 100755
--- a/packages/flutter/lib/src/material/stepper.dart
+++ b/packages/flutter/lib/src/material/stepper.dart
@@ -713,7 +713,6 @@ class _StepperState extends State<Stepper> with TickerProviderStateMixin {
               AnimatedSize(
                 curve: Curves.fastOutSlowIn,
                 duration: kThemeAnimationDuration,
-                vsync: this,
                 child: widget.steps[widget.currentStep].content,
               ),
               _buildVerticalControls(),
diff --git a/packages/flutter/lib/src/material/text_selection_toolbar.dart b/packages/flutter/lib/src/material/text_selection_toolbar.dart
index e1f5555dda..229159a79f 100644
--- a/packages/flutter/lib/src/material/text_selection_toolbar.dart
+++ b/packages/flutter/lib/src/material/text_selection_toolbar.dart
@@ -189,7 +189,6 @@ class _TextSelectionToolbarOverflowableState extends State<_TextSelectionToolbar
       overflowOpen: _overflowOpen,
       textDirection: Directionality.of(context),
       child: AnimatedSize(
-        vsync: this,
         // This duration was eyeballed on a Pixel 2 emulator running Android
         // API 28.
         duration: const Duration(milliseconds: 140),
diff --git a/packages/flutter/lib/src/widgets/animated_cross_fade.dart b/packages/flutter/lib/src/widgets/animated_cross_fade.dart
index 8a386f698b..0ee3fa6c08 100644
--- a/packages/flutter/lib/src/widgets/animated_cross_fade.dart
+++ b/packages/flutter/lib/src/widgets/animated_cross_fade.dart
@@ -366,7 +366,6 @@ class _AnimatedCrossFadeState extends State<AnimatedCrossFade> with TickerProvid
         duration: widget.duration,
         reverseDuration: widget.reverseDuration,
         curve: widget.sizeCurve,
-        vsync: this,
         child: widget.layoutBuilder(topChild, topKey, bottomChild, bottomKey),
       ),
     );
diff --git a/packages/flutter/lib/src/widgets/animated_size.dart b/packages/flutter/lib/src/widgets/animated_size.dart
index bcf7cc80d2..87697f3861 100644
--- a/packages/flutter/lib/src/widgets/animated_size.dart
+++ b/packages/flutter/lib/src/widgets/animated_size.dart
@@ -60,8 +60,11 @@ class AnimatedSize extends StatefulWidget {
     this.curve = Curves.linear,
     required this.duration,
     this.reverseDuration,
-    // TODO(jsimmons): deprecate when customers tests are updated.
-    TickerProvider? vsync, // ignore: avoid_unused_constructor_parameters
+    @Deprecated(
+      'This field is now ignored. '
+      'This feature was deprecated after v2.2.0-10.1.pre.'
+    )
+    TickerProvider? vsync,
     this.clipBehavior = Clip.hardEdge,
   }) : assert(clipBehavior != null),
        super(key: key);
diff --git a/packages/flutter/test/widgets/animated_size_test.dart b/packages/flutter/test/widgets/animated_size_test.dart
index 606efe5776..ddbb444eda 100644
--- a/packages/flutter/test/widgets/animated_size_test.dart
+++ b/packages/flutter/test/widgets/animated_size_test.dart
@@ -19,11 +19,10 @@ void main() {
   group('AnimatedSize', () {
     testWidgets('animates forwards then backwards with stable-sized children', (WidgetTester tester) async {
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: AnimatedSize(
-            duration: const Duration(milliseconds: 200),
-            vsync: tester,
-            child: const SizedBox(
+            duration: Duration(milliseconds: 200),
+            child: SizedBox(
               width: 100.0,
               height: 100.0,
             ),
@@ -36,11 +35,10 @@ void main() {
       expect(box.size.height, equals(100.0));
 
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: AnimatedSize(
-            duration: const Duration(milliseconds: 200),
-            vsync: tester,
-            child: const SizedBox(
+            duration: Duration(milliseconds: 200),
+            child: SizedBox(
               width: 200.0,
               height: 200.0,
             ),
@@ -63,11 +61,10 @@ void main() {
       expect(box.size.height, equals(200.0));
 
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: AnimatedSize(
-            duration: const Duration(milliseconds: 200),
-            vsync: tester,
-            child: const SizedBox(
+            duration: Duration(milliseconds: 200),
+            child: SizedBox(
               width: 100.0,
               height: 100.0,
             ),
@@ -92,14 +89,13 @@ void main() {
 
     testWidgets('clamps animated size to constraints', (WidgetTester tester) async {
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: SizedBox (
             width: 100.0,
             height: 100.0,
             child: AnimatedSize(
-              duration: const Duration(milliseconds: 200),
-              vsync: tester,
-              child: const SizedBox(
+              duration: Duration(milliseconds: 200),
+              child: SizedBox(
                 width: 100.0,
                 height: 100.0,
               ),
@@ -114,14 +110,13 @@ void main() {
 
       // Attempt to animate beyond the outer SizedBox.
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: SizedBox (
             width: 100.0,
             height: 100.0,
             child: AnimatedSize(
-              duration: const Duration(milliseconds: 200),
-              vsync: tester,
-              child: const SizedBox(
+              duration: Duration(milliseconds: 200),
+              child: SizedBox(
                 width: 200.0,
                 height: 200.0,
               ),
@@ -158,7 +153,6 @@ void main() {
         Center(
           child: AnimatedSize(
             duration: const Duration(milliseconds: 200),
-            vsync: tester,
             child: AnimatedContainer(
               duration: const Duration(milliseconds: 100),
               width: 100.0,
@@ -175,7 +169,6 @@ void main() {
         Center(
           child: AnimatedSize(
             duration: const Duration(milliseconds: 200),
-            vsync: tester,
             child: AnimatedContainer(
               duration: const Duration(milliseconds: 100),
               width: 200.0,
@@ -204,7 +197,6 @@ void main() {
         Center(
           child: AnimatedSize(
             duration: const Duration(milliseconds: 200),
-            vsync: tester,
             child: AnimatedContainer(
               duration: const Duration(milliseconds: 1),
               width: 100.0,
@@ -228,7 +220,6 @@ void main() {
         const Center(
           child: AnimatedSize(
             duration: Duration(milliseconds: 200),
-            vsync: TestVSync(),
             child: SizedBox(
               width: 100.0,
               height: 100.0,
@@ -238,11 +229,10 @@ void main() {
       );
 
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: AnimatedSize(
-            duration: const Duration(milliseconds: 200),
-            vsync: tester,
-            child: const SizedBox(
+            duration: Duration(milliseconds: 200),
+            child: SizedBox(
               width: 200.0,
               height: 100.0,
             ),
@@ -258,11 +248,10 @@ void main() {
 
     testWidgets('does not run animation unnecessarily', (WidgetTester tester) async {
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: AnimatedSize(
-            duration: const Duration(milliseconds: 200),
-            vsync: tester,
-            child: const SizedBox(
+            duration: Duration(milliseconds: 200),
+            child: SizedBox(
               width: 100.0,
               height: 100.0,
             ),
@@ -282,11 +271,10 @@ void main() {
 
     testWidgets('can set and update clipBehavior', (WidgetTester tester) async {
       await tester.pumpWidget(
-        Center(
+        const Center(
           child: AnimatedSize(
-            duration: const Duration(milliseconds: 200),
-            vsync: tester,
-            child: const SizedBox(
+            duration: Duration(milliseconds: 200),
+            child: SizedBox(
               width: 100.0,
               height: 100.0,
             ),
@@ -303,7 +291,6 @@ void main() {
           Center(
             child: AnimatedSize(
               duration: const Duration(milliseconds: 200),
-              vsync: tester,
               clipBehavior: clip,
               child: const SizedBox(
                 width: 100.0,
@@ -327,7 +314,6 @@ void main() {
                   AnimatedSize(
                     duration: const Duration(milliseconds: 200),
                     curve: Curves.easeInOutBack,
-                    vsync: tester,
                     child: SizedBox(
                       width: size.width,
                       height: size.height,