Standardize usage of virtual/override/final in content/browser/

content/browser/compositor/browser_compositor_ca_layer_tree_mac.h

 // 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.
 
 #ifndef CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_CA_LAYER_TREE_MAC_H_
 #define CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_CA_LAYER_TREE_MAC_H_
 
 #include <IOSurface/IOSurfaceAPI.h>
 
 #include "content/browser/compositor/browser_compositor_view_mac.h"
@@ skipping 43 matching lines @@
   void GotAcceleratedFrame(
       uint64 surface_handle, int output_surface_id,
       const std::vector<ui::LatencyInfo>& latency_info,
       gfx::Size pixel_size, float scale_factor);
 
   void GotSoftwareFrame(
       cc::SoftwareFrameData* frame_data, float scale_factor, SkCanvas* canvas);
 
 private:
   // IOSurfaceLayerClient implementation:
-  virtual bool IOSurfaceLayerShouldAckImmediately() const override;
-  virtual void IOSurfaceLayerDidDrawFrame() override;
-  virtual void IOSurfaceLayerHitError() override;
+ bool IOSurfaceLayerShouldAckImmediately() const override;
+ void IOSurfaceLayerDidDrawFrame() override;
+ void IOSurfaceLayerHitError() override;
 
   void GotAcceleratedCAContextFrame(
       CAContextID ca_context_id, gfx::Size pixel_size, float scale_factor);
 
   void GotAcceleratedIOSurfaceFrame(
       IOSurfaceID io_surface_id, gfx::Size pixel_size, float scale_factor);
 
   // Remove a layer from the heirarchy and destroy it. Because the accelerated
   // layer types may be replaced by a layer of the same type, the layer to
   // destroy is parameterized, and, if it is the current layer, the current
@@ skipping 50 matching lines @@
     gfx::Size pixel_size, float scale_factor,
     bool* disable_throttling, int* renderer_id);
 
 void BrowserCompositorCALayerTreeMacGotSoftwareFrame(
     gfx::AcceleratedWidget widget,
     cc::SoftwareFrameData* frame_data, float scale_factor, SkCanvas* canvas);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_COMPOSITOR_BROWSER_COMPOSITOR_CA_LAYER_TREE_MAC_H_