Update Dart revision to 3.8.0-278.4.beta (#168391)

* Updated Dart revision to [`e7f2f0556e3e57acb60749467e54f9a44b2bfc76`](http://goto.google.com/dart-hash/e7f2f0556e3e57acb60749467e54f9a44b2bfc76) (`3.8.0-278.4.beta`).
* ~Ran `gclient sync -D` and `tools/dart/create_updated_flutter_deps.py` (nothing was updated)~ ran wrong command
* Ran `gclient sync -D` and `tools/dart/create_updated_flutter_deps.py -f <flutter_DEPS_file_path>` (Dart style revision was updated)

DEPS

@@ -56,7 +56,7 @@ vars = {
   # Dart is: https://github.com/dart-lang/sdk/blob/main/DEPS
   # You can use //tools/dart/create_updated_flutter_deps.py to produce
   # updated revision list of existing dependencies.
-  'dart_revision': '9003f7927a24fd87c34154e04585bfbcfd4d9188',
+  'dart_revision': 'e7f2f0556e3e57acb60749467e54f9a44b2bfc76',
 
   # WARNING: DO NOT EDIT MANUALLY
   # The lines between blank lines above and below are generated by a script. See create_updated_flutter_deps.py
@@ -314,7 +314,7 @@ deps = {
    Var('dart_git') + '/core.git' + '@' + Var('dart_core_rev'),
 
   'engine/src/flutter/third_party/dart/third_party/pkg/dart_style':
-   Var('dart_git') + '/dart_style.git@21de99ec0ff8ace4d946a746fb427fffd6afa535',
+   Var('dart_git') + '/dart_style.git@100db45075abdd66fd8788b205243e90ff0595df',
 
   'engine/src/flutter/third_party/dart/third_party/pkg/dartdoc':
    Var('dart_git') + '/dartdoc.git@62aefbb788baf5b73b2d704d66d9735a7ca56a69',

engine/src/flutter/ci/licenses_golden/licenses_dart

@@ -1,4 +1,4 @@
-Signature: e41496825525b0b25bd65a5a8e93c81a
+Signature: f4f0a7ce457a816a7b8e0f13355125f4
 
 ====================================================================================================
 LIBRARY: dart
@@ -4858,7 +4858,7 @@ Exhibit B - "Incompatible With Secondary Licenses" Notice
   This Source Code Form is "Incompatible With Secondary Licenses", as
   defined by the Mozilla Public License, v. 2.0.
 
-You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/0d6811928830b87e36a0f49eb7fe554c308d3699
+You may obtain a copy of this library's Source Code Form from: https://dart.googlesource.com/sdk/+/e7f2f0556e3e57acb60749467e54f9a44b2bfc76
 /third_party/fallback_root_certificates/
 
 ====================================================================================================

packages/flutter_tools/templates/widget_preview_scaffold/lib/src/widget_preview_rendering.dart.tmpl

@@ -96,8 +96,7 @@ class _WidgetPreviewErrorWidget extends StatelessWidget {
           TextSpan(
             text: frame.location,
             style: linkTextStyle,
-            recognizer:
-                TapGestureRecognizer()
+            recognizer: TapGestureRecognizer()
               ..onTap = () {
                 // TODO(bkonyi): notify IDEs to navigate to the source location via DTD.
               },
@@ -244,11 +243,8 @@ class WidgetPreviewerWindowConstraints extends InheritedWidget {
   final BoxConstraints constraints;
 
   static BoxConstraints getRootConstraints(BuildContext context) {
-    final result =
-        context
-            .dependOnInheritedWidgetOfExactType<
-              WidgetPreviewerWindowConstraints
-            >();
+    final result = context
+        .dependOnInheritedWidgetOfExactType<WidgetPreviewerWindowConstraints>();
     assert(
       result != null,
       'No WidgetPreviewerWindowConstraints founds in context',
@@ -348,8 +344,7 @@ class _WidgetPreviewWrapperBox extends RenderShiftedBox {
       // the previewer. In this case, apply finite constraints (e.g., the
       // constraints for the root of the previewer). Otherwise, use the
       // widget's actual constraints.
-      _constraintOverride =
-          minInstrinsicHeight == 0
+      _constraintOverride = minInstrinsicHeight == 0
           ? _previewerConstraints
           : const BoxConstraints();
     }
@@ -483,16 +478,14 @@ class _WidgetPreviewScaffold extends StatelessWidget {
                     IconButton(
                       onPressed: () => _toggleLayout(LayoutType.gridView),
                       icon: Icon(Icons.grid_on),
-                      color:
-                          selectedLayout == LayoutType.gridView
+                      color: selectedLayout == LayoutType.gridView
                           ? Colors.blue
                           : Colors.black,
                     ),
                     IconButton(
                       onPressed: () => _toggleLayout(LayoutType.listView),
                       icon: Icon(Icons.view_list),
-                      color:
-                          selectedLayout == LayoutType.listView
+                      color: selectedLayout == LayoutType.listView
                           ? Colors.blue
                           : Colors.black,
                     ),

packages/flutter_tools/test/widget_preview_scaffold.shard/widget_preview_scaffold/lib/src/widget_preview_rendering.dart

@@ -96,8 +96,7 @@ class _WidgetPreviewErrorWidget extends StatelessWidget {
           TextSpan(
             text: frame.location,
             style: linkTextStyle,
-            recognizer:
-                TapGestureRecognizer()
+            recognizer: TapGestureRecognizer()
               ..onTap = () {
                 // TODO(bkonyi): notify IDEs to navigate to the source location via DTD.
               },
@@ -244,11 +243,8 @@ class WidgetPreviewerWindowConstraints extends InheritedWidget {
   final BoxConstraints constraints;
 
   static BoxConstraints getRootConstraints(BuildContext context) {
-    final result =
-        context
-            .dependOnInheritedWidgetOfExactType<
-              WidgetPreviewerWindowConstraints
-            >();
+    final result = context
+        .dependOnInheritedWidgetOfExactType<WidgetPreviewerWindowConstraints>();
     assert(
       result != null,
       'No WidgetPreviewerWindowConstraints founds in context',
@@ -348,8 +344,7 @@ class _WidgetPreviewWrapperBox extends RenderShiftedBox {
       // the previewer. In this case, apply finite constraints (e.g., the
       // constraints for the root of the previewer). Otherwise, use the
       // widget's actual constraints.
-      _constraintOverride =
-          minInstrinsicHeight == 0
+      _constraintOverride = minInstrinsicHeight == 0
           ? _previewerConstraints
           : const BoxConstraints();
     }
@@ -483,16 +478,14 @@ class _WidgetPreviewScaffold extends StatelessWidget {
                     IconButton(
                       onPressed: () => _toggleLayout(LayoutType.gridView),
                       icon: Icon(Icons.grid_on),
-                      color:
-                          selectedLayout == LayoutType.gridView
+                      color: selectedLayout == LayoutType.gridView
                           ? Colors.blue
                           : Colors.black,
                     ),
                     IconButton(
                       onPressed: () => _toggleLayout(LayoutType.listView),
                       icon: Icon(Icons.view_list),
-                      color:
-                          selectedLayout == LayoutType.listView
+                      color: selectedLayout == LayoutType.listView
                           ? Colors.blue
                           : Colors.black,
                     ),