Standardize usage of virtual/override/final in cc/

cc/quads/io_surface_draw_quad.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_QUADS_IO_SURFACE_DRAW_QUAD_H_
 #define CC_QUADS_IO_SURFACE_DRAW_QUAD_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/quads/draw_quad.h"
@@ skipping 25 matching lines @@
               const gfx::Rect& visible_rect,
               bool needs_blending,
               const gfx::Size& io_surface_size,
               unsigned io_surface_resource_id,
               Orientation orientation);
 
   gfx::Size io_surface_size;
   unsigned io_surface_resource_id;
   Orientation orientation;
 
-  virtual void IterateResources(const ResourceIteratorCallback& callback)
-      override;
+  void IterateResources(const ResourceIteratorCallback& callback) override;
 
   static const IOSurfaceDrawQuad* MaterialCast(const DrawQuad*);
 
  private:
-  virtual void ExtendValue(base::debug::TracedValue* value) const override;
+  void ExtendValue(base::debug::TracedValue* value) const override;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_IO_SURFACE_DRAW_QUAD_H_