Standardize usage of virtual/override/final in cc/

cc/test/fake_tile_manager_client.h

 // Copyright 2012 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.
 
 #ifndef CC_TEST_FAKE_TILE_MANAGER_CLIENT_H_
 #define CC_TEST_FAKE_TILE_MANAGER_CLIENT_H_
 
 #include <vector>
 
 #include "cc/resources/tile_manager.h"
 
 namespace cc {
 
 class FakeTileManagerClient : public TileManagerClient {
  public:
   FakeTileManagerClient();
-  virtual ~FakeTileManagerClient();
+  ~FakeTileManagerClient() override;
 
   // TileManagerClient implementation.
-  virtual const std::vector<PictureLayerImpl*>& GetPictureLayers()
-      const override;
-  virtual void NotifyReadyToActivate() override {}
-  virtual void NotifyTileStateChanged(const Tile* tile) override {}
-  virtual void BuildRasterQueue(RasterTilePriorityQueue* queue,
-                                TreePriority tree_priority) override {}
-  virtual void BuildEvictionQueue(EvictionTilePriorityQueue* queue,
-                                  TreePriority tree_priority) override {}
+  const std::vector<PictureLayerImpl*>& GetPictureLayers() const override;
+  void NotifyReadyToActivate() override {}
+  void NotifyTileStateChanged(const Tile* tile) override {}
+  void BuildRasterQueue(RasterTilePriorityQueue* queue,
+                        TreePriority tree_priority) override {}
+  void BuildEvictionQueue(EvictionTilePriorityQueue* queue,
+                          TreePriority tree_priority) override {}
 
  private:
   std::vector<PictureLayerImpl*> picture_layers_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_TILE_MANAGER_CLIENT_H_