Standardize usage of virtual/override/final in cc/

cc/resources/gpu_raster_worker_pool.cc

 // Copyright 2014 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/resources/gpu_raster_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/debug/trace_event.h"
 #include "cc/output/context_provider.h"
@@ skipping 14 matching lines @@
 class RasterBufferImpl : public RasterBuffer {
  public:
   RasterBufferImpl(ResourceProvider* resource_provider,
                    const Resource* resource,
                    SkMultiPictureDraw* multi_picture_draw)
       : lock_(resource_provider, resource->id()),
         resource_(resource),
         multi_picture_draw_(multi_picture_draw) {}
 
   // Overridden from RasterBuffer:
-  virtual void Playback(const PicturePileImpl* picture_pile,
-                        const gfx::Rect& rect,
-                        float scale,
-                        RenderingStatsInstrumentation* stats) override {
+  void Playback(const PicturePileImpl* picture_pile,
+                const gfx::Rect& rect,
+                float scale,
+                RenderingStatsInstrumentation* stats) override {
     if (!lock_.sk_surface())
       return;
 
     SkPictureRecorder recorder;
     gfx::Size size = resource_->size();
     skia::RefPtr<SkCanvas> canvas =
         skia::SharePtr(recorder.beginRecording(size.width(), size.height()));
 
     canvas->save();
     picture_pile->RasterToBitmap(canvas.get(), rect, scale, stats);
@@ skipping 177 matching lines @@
 
   ScopedGpuRaster gpu_raster(context_provider_);
   task_graph_runner_->RunUntilIdle();
 
   // Draw each all of the pictures that were collected.  This will also clear
   // the pictures and canvases added to |multi_picture_draw_|
   multi_picture_draw_.draw();
 }
 
 }  // namespace cc