[native assets] Cleanup dead code (#161913)

This PR deletes dead code.

Testing: No new use cases covered, all existing use cases covered by
existing tests.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [ ] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [ ] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

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on [Discord].

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https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
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[Features we expect every widget to implement]:
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[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

packages/flutter_tools/lib/src/build_system/targets/native_assets.dart

@@ -42,7 +42,6 @@ abstract class DartBuild extends Target {
       final FlutterNativeAssetsBuildRunner buildRunner =
           _buildRunner ??
           FlutterNativeAssetsBuildRunnerImpl(
-            projectUri,
             environment.packageConfigPath,
             packageConfig,
             fileSystem,

packages/flutter_tools/lib/src/isolated/native_assets/native_assets.dart

@@ -193,14 +193,12 @@ abstract interface class FlutterNativeAssetsBuildRunner {
 /// Uses `package:native_assets_builder` for its implementation.
 class FlutterNativeAssetsBuildRunnerImpl implements FlutterNativeAssetsBuildRunner {
   FlutterNativeAssetsBuildRunnerImpl(
-    this.projectUri,
     this.packageConfigPath,
     this.packageConfig,
     this.fileSystem,
     this.logger,
   );
 
-  final Uri projectUri;
   final String packageConfigPath;
   final PackageConfig packageConfig;
   final FileSystem fileSystem;
@@ -235,14 +233,8 @@ class FlutterNativeAssetsBuildRunnerImpl implements FlutterNativeAssetsBuildRunn
     logger: _logger,
     dartExecutable: _dartExecutable,
     fileSystem: fileSystem,
-    hookEnvironment: filteredEnvironment(NativeAssetsBuildRunner.hookEnvironmentVariablesFilter),
   );
 
-  static Map<String, String> filteredEnvironment(Set<String> allowList) => <String, String>{
-    for (final MapEntry<String, String> entry in const LocalPlatform().environment.entries)
-      if (allowList.contains(entry.key.toUpperCase())) entry.key: entry.value,
-  };
-
   @override
   Future<bool> hasPackageConfig() {
     return fileSystem.file(packageConfigPath).exists();

packages/flutter_tools/lib/src/isolated/native_assets/test/native_assets.dart

@@ -30,7 +30,6 @@ Future<Uri?> testCompilerBuildNativeAssets(BuildInfo buildInfo) async {
   }
   final Uri projectUri = FlutterProject.current().directory.uri;
   final FlutterNativeAssetsBuildRunner buildRunner = FlutterNativeAssetsBuildRunnerImpl(
-    projectUri,
     buildInfo.packageConfigPath,
     buildInfo.packageConfig,
     globals.fs,

packages/flutter_tools/test/general.shard/isolated/linux/native_assets_test.dart

@@ -112,7 +112,6 @@ void main() {
         logger: environment.logger,
       );
       final FlutterNativeAssetsBuildRunner runner = FlutterNativeAssetsBuildRunnerImpl(
-        projectUri,
         packageConfigFile.path,
         packageConfig,
         fileSystem,

packages/flutter_tools/test/general.shard/isolated/macos/native_assets_test.dart

@@ -397,7 +397,6 @@ InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault
         logger: environment.logger,
       );
       final FlutterNativeAssetsBuildRunner runner = FlutterNativeAssetsBuildRunnerImpl(
-        projectUri,
         packageConfigFile.path,
         packageConfig,
         fileSystem,

packages/flutter_tools/test/general.shard/isolated/windows/native_assets_test.dart

@@ -264,7 +264,6 @@ void main() {
         logger: environment.logger,
       );
       final FlutterNativeAssetsBuildRunner runner = FlutterNativeAssetsBuildRunnerImpl(
-        projectUri,
         packageConfigFile.path,
         packageConfig,
         fileSystem,