cc: Fix overlay damage tracking bug

cc/output/direct_renderer.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_OUTPUT_DIRECT_RENDERER_H_
 #define CC_OUTPUT_DIRECT_RENDERER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/containers/scoped_ptr_hash_map.h"
@@ skipping 142 matching lines @@
   // stores the values for the current render pass; in between draws, they
   // retain the values for the root render pass of the last draw.
   gfx::Rect current_draw_rect_;
   gfx::Rect current_viewport_rect_;
   gfx::Size current_surface_size_;
   gfx::Rect current_window_space_viewport_;
 
  private:
   gfx::Vector2d enlarge_pass_texture_amount_;
 
-  // Regions that must be drawn in the next frame because they were represented
-  // as CALayers in the current frame.
-  gfx::Rect next_root_damage_rect_;
-
   DISALLOW_COPY_AND_ASSIGN(DirectRenderer);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_DIRECT_RENDERER_H_