Remove most of the target logic for build web, cleanup rules (#34589)

packages/flutter_tools/lib/src/resident_web_runner.dart

@@ -131,8 +131,7 @@ class ResidentWebRunner extends ResidentRunner {
     }
     // Start the web compiler and build the assets.
     await webCompilationProxy.initialize(
-      projectDirectory: FlutterProject.current().directory,
-      targets: <String>[target],
+      projectDirectory: flutterProject.directory,
     );
     _lastCompiled = DateTime.now();
     final AssetBundle assetBundle = AssetBundleFactory.instance.createBundle();

packages/flutter_tools/lib/src/test/runner.dart

@@ -76,9 +76,6 @@ Future<int> runTests(
     final bool result = await webCompilationProxy.initialize(
       projectDirectory: flutterProject.directory,
       testOutputDir: tempBuildDir,
-      targets: testFiles.map((String testFile) {
-        return fs.path.relative(testFile, from: flutterProject.directory.path);
-      }).toList(),
     );
     if (!result) {
       throwToolExit('Failed to compile tests');

packages/flutter_tools/lib/src/web/compile.dart

@@ -30,7 +30,6 @@ Future<void> buildWeb(FlutterProject flutterProject, String target, BuildInfo bu
   try {
     result = await webCompilationProxy.initialize(
       projectDirectory: FlutterProject.current().directory,
-      targets: <String>[target],
       release: buildInfo.isRelease,
     );
     if (result) {
@@ -79,11 +78,8 @@ class WebCompilationProxy {
   ///
   /// `release` controls whether we build the bundle for dartdevc or only
   /// the entrypoints for dart2js to later take over.
-  ///
-  /// `targets` controls the specific compiler targets.
   Future<bool> initialize({
     @required Directory projectDirectory,
-    @required List<String> targets,
     String testOutputDir,
     bool release,
   }) async {

packages/flutter_tools/test/commands/build_web_test.dart

@@ -38,7 +38,6 @@ void main() {
       fs.file(fs.path.join('lib', 'main.dart')).createSync(recursive: true);
       when(mockWebCompilationProxy.initialize(
         projectDirectory: anyNamed('projectDirectory'),
-        targets: anyNamed('targets'),
         release: anyNamed('release')
       )).thenAnswer((Invocation invocation) {
         final String path = fs.path.join('.dart_tool', 'build', 'flutter_web', 'foo', 'lib', 'main_web_entrypoint.dart.js');