Standardize usage of virtual/override/final in cc/

cc/layers/picture_layer_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_layer.h"
 
 #include "cc/layers/content_layer_client.h"
 #include "cc/layers/picture_layer_impl.h"
 #include "cc/resources/resource_update_queue.h"
 #include "cc/test/fake_layer_tree_host.h"
 #include "cc/test/fake_picture_layer_impl.h"
 #include "cc/test/fake_proxy.h"
 #include "cc/test/impl_side_painting_settings.h"
 #include "cc/trees/occlusion_tracker.h"
 #include "cc/trees/single_thread_proxy.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace cc {
 namespace {
 
 class MockContentLayerClient : public ContentLayerClient {
  public:
-  virtual void PaintContents(
+  void PaintContents(
       SkCanvas* canvas,
       const gfx::Rect& clip,
       ContentLayerClient::GraphicsContextStatus gc_status) override {}
-  virtual void DidChangeLayerCanUseLCDText() override {}
-  virtual bool FillsBoundsCompletely() const override {
-    return false;
-  };
+  void DidChangeLayerCanUseLCDText() override {}
+  bool FillsBoundsCompletely() const override { return false; };
 };
 
 TEST(PictureLayerTest, NoTilesIfEmptyBounds) {
   MockContentLayerClient client;
   scoped_refptr<PictureLayer> layer = PictureLayer::Create(&client);
   layer->SetBounds(gfx::Size(10, 10));
 
   FakeLayerTreeHostClient host_client(FakeLayerTreeHostClient::DIRECT_3D);
   scoped_ptr<FakeLayerTreeHost> host = FakeLayerTreeHost::Create(&host_client);
   host->SetRootLayer(layer);
@@ skipping 56 matching lines @@
 
   // Tile-grid is set according to its setting.
   SkTileGridFactory::TileGridInfo info =
       layer->GetPicturePileForTesting()->GetTileGridInfoForTesting();
   EXPECT_EQ(info.fTileInterval.width(), 123 - 2 * info.fMargin.width());
   EXPECT_EQ(info.fTileInterval.height(), 123 - 2 * info.fMargin.height());
 }
 
 }  // namespace
 }  // namespace cc