[flutter_driver] Remove `runUnsynchronized` in `VMServiceFlutterDriver` (#87467)

packages/flutter_driver/lib/src/driver/vmservice_driver.dart

@@ -485,18 +485,6 @@ class VMServiceFlutterDriver extends FlutterDriver {
     }
   }
 
-  @override
-  Future<T> runUnsynchronized<T>(Future<T> Function() action, { Duration? timeout }) async {
-    await sendCommand(SetFrameSync(false, timeout: timeout));
-    T result;
-    try {
-      result = await action();
-    } finally {
-      await sendCommand(SetFrameSync(true, timeout: timeout));
-    }
-    return result;
-  }
-
   @override
   Future<void> forceGC() async {
     try {

packages/flutter_driver/test/src/real_tests/flutter_driver_test.dart

@@ -666,6 +666,23 @@ void main() {
     test('VMServiceFlutterDriver does not support webDriver', () async {
       expect(() => driver.webDriver, throwsUnsupportedError);
     });
+
+    group('runUnsynchronized', () {
+      test('wrap waitFor with runUnsynchronized', () async {
+        fakeClient.responses['waitFor'] = makeFakeResponse(<String, dynamic>{});
+        fakeClient.responses['set_frame_sync'] = makeFakeResponse(<String, dynamic>{});
+
+        await driver.runUnsynchronized(() async  {
+          await driver.waitFor(find.byTooltip('foo'), timeout: _kTestTimeout);
+        });
+
+        expect(fakeClient.commandLog, <String>[
+          'ext.flutter.driver {command: set_frame_sync, enabled: false}',
+          'ext.flutter.driver {command: waitFor, timeout: $_kSerializedTestTimeout, finderType: ByTooltipMessage, text: foo}',
+          'ext.flutter.driver {command: set_frame_sync, enabled: true}'
+        ]);
+      });
+    });
   });
 
   group('VMServiceFlutterDriver with custom timeout', () {
@@ -965,6 +982,23 @@ void main() {
         expect(() => driver.serviceClient.getVM(), throwsUnsupportedError);
       });
     });
+
+    group('runUnsynchronized', () {
+      test('wrap waitFor with runUnsynchronized', () async {
+        fakeConnection.responses['waitFor'] = jsonEncode(makeFakeResponse(<String, dynamic>{'text': 'hello'}));
+        fakeConnection.responses['set_frame_sync'] = jsonEncode(makeFakeResponse(<String, dynamic>{}));
+
+        await driver.runUnsynchronized(() async {
+          await driver.waitFor(find.byTooltip('foo'), timeout: _kTestTimeout);
+        });
+
+        expect(fakeConnection.commandLog, <String>[
+          r'''window.$flutterDriver('{"command":"set_frame_sync","enabled":"false"}') null''',
+          r'''window.$flutterDriver('{"command":"waitFor","timeout":"1234","finderType":"ByTooltipMessage","text":"foo"}') 0:00:01.234000''',
+          r'''window.$flutterDriver('{"command":"set_frame_sync","enabled":"true"}') null''',
+        ]);
+      });
+    });
   });
 
   group('WebFlutterDriver with non-chrome browser', () {