Fix unused variables errors in cc/.

cc/layers/render_surface.h

 // Copyright 2010 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_LAYERS_RENDER_SURFACE_H_
 #define CC_LAYERS_RENDER_SURFACE_H_
 
 #include <vector>
 
@@ skipping 122 matching lines @@
 
   // Uses the space of the surface's target surface.
   gfx::Rect clip_rect_;
 
   LayerList layer_list_;
 
   // The nearest ancestor target surface that will contain the contents of this
   // surface, and that ignores outside occlusion. This can point to itself.
   RenderSurface* nearest_occlusion_immune_ancestor_;
 
-  // For LayerIteratorActions
-  int target_render_surface_layer_index_history_;
-  size_t current_layer_index_history_;
-
   DISALLOW_COPY_AND_ASSIGN(RenderSurface);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_RENDER_SURFACE_H_