remove unnecessary overrides (#23650)

diff --git a/dev/integration_tests/channels/lib/main.dart b/dev/integration_tests/channels/lib/main.dart
index 9c95fbf..8dd4896 100644
--- a/dev/integration_tests/channels/lib/main.dart
+++ b/dev/integration_tests/channels/lib/main.dart

@@ -156,11 +156,6 @@
   Future<TestStepResult> _result;
   int _step = 0;
 
-  @override
-  void initState() {
-    super.initState();
-  }
-
   void _executeNextStep() {
     setState(() {
       if (_step < steps.length)

diff --git a/dev/integration_tests/platform_interaction/lib/main.dart b/dev/integration_tests/platform_interaction/lib/main.dart
index 8341d53..b977895 100644
--- a/dev/integration_tests/platform_interaction/lib/main.dart
+++ b/dev/integration_tests/platform_interaction/lib/main.dart

@@ -27,11 +27,6 @@
   Future<TestStepResult> _result;
   int _step = 0;
 
-  @override
-  void initState() {
-    super.initState();
-  }
-
   void _executeNextStep() {
     setState(() {
       if (_step < steps.length)

diff --git a/packages/flutter/test/painting/decoration_test.dart b/packages/flutter/test/painting/decoration_test.dart
index b05189c..e38d554 100644
--- a/packages/flutter/test/painting/decoration_test.dart
+++ b/packages/flutter/test/painting/decoration_test.dart

@@ -62,11 +62,6 @@
   }
 
   @override
-  ImageStream resolve(ImageConfiguration configuration) {
-    return super.resolve(configuration);
-  }
-
-  @override
   ImageStreamCompleter load(DelayedImageProvider key) {
     return OneFrameImageStreamCompleter(_completer.future);
   }