unnecessary statements (#12189)

dev/bots/test.dart

@@ -263,7 +263,6 @@ Future<Null> _verifyNoBadImports(String workingDirectory) async {
   final String libPath = path.join(workingDirectory, 'packages', 'flutter', 'lib');
   final String srcPath = path.join(workingDirectory, 'packages', 'flutter', 'lib', 'src');
   // Verify there's one libPath/*.dart for each srcPath/*/.
-  <String>[];
   final List<String> packages = new Directory(libPath).listSync()
     .where((FileSystemEntity entity) => entity is File && path.extension(entity.path) == '.dart')
     .map<String>((FileSystemEntity entity) => path.basenameWithoutExtension(entity.path))

packages/flutter/lib/src/rendering/image.dart

@@ -128,7 +128,7 @@ class RenderImage extends RenderBox {
   set colorBlendMode(BlendMode value) {
     if (value == _colorBlendMode)
       return;
-    _colorBlendMode;
+    _colorBlendMode = value;
     _updateColorFilter();
     markNeedsPaint();
   }

packages/flutter/test/rendering/image_test.dart

@@ -201,4 +201,11 @@ void main() {
     expect(image.size.width, equals(75.0));
     expect(image.size.height, equals(75.0));
   });
+
+  test('update image colorBlendMode', () {
+    final RenderImage image = new RenderImage();
+    expect(image.colorBlendMode, isNull);
+    image.colorBlendMode = BlendMode.color;
+    expect(image.colorBlendMode, BlendMode.color);
+  });
 }