Update the exception thrown for invalid data in the codec test (#9929)

testing/dart/codec_test.dart

@@ -28,8 +28,8 @@ void main() {
   test('Fails with invalid data', () async {
     final Uint8List data = Uint8List.fromList(<int>[1, 2, 3]);
     expect(
-      ui.instantiateImageCodec(data),
-      throwsA(exceptionWithMessage('operation failed'))
+      () => ui.instantiateImageCodec(data),
+      throwsA(exceptionWithMessage('Could not instantiate image codec.'))
     );
   });