Standardize usage of virtual/override/final in cc/

cc/resources/pixel_buffer_raster_worker_pool.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/resources/pixel_buffer_raster_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/containers/stack_container.h"
 #include "base/debug/trace_event.h"
@@ skipping 12 matching lines @@
   RasterBufferImpl(ResourceProvider* resource_provider,
                    const Resource* resource)
       : resource_provider_(resource_provider),
         resource_(resource),
         memory_(NULL),
         stride_(0) {
     resource_provider_->AcquirePixelBuffer(resource_->id());
     memory_ = resource_provider_->MapPixelBuffer(resource_->id(), &stride_);
   }
 
-  virtual ~RasterBufferImpl() {
+  ~RasterBufferImpl() override {
     resource_provider_->ReleasePixelBuffer(resource_->id());
   }
 
   // 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 (!memory_)
       return;
 
     RasterWorkerPool::PlaybackToMemory(memory_,
                                        resource_->format(),
                                        resource_->size(),
                                        stride_,
                                        picture_pile,
                                        rect,
                                        scale,
@@ skipping 694 matching lines @@
 void PixelBufferRasterWorkerPool::ThrottleStateAsValueInto(
     base::debug::TracedValue* throttle_state) const {
   throttle_state->SetInteger("bytes_available_for_upload",
                              max_bytes_pending_upload_ - bytes_pending_upload_);
   throttle_state->SetInteger("bytes_pending_upload", bytes_pending_upload_);
   throttle_state->SetInteger("scheduled_raster_task_count",
                              scheduled_raster_task_count_);
 }
 
 }  // namespace cc