cc: Remove code for drawing checkerboard quads, it's not used.

cc/layers/layer.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_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 298 matching lines @@
     return touch_event_handler_region_;
   }
 
   void SetScrollBlocksOn(ScrollBlocksOn scroll_blocks_on);
   ScrollBlocksOn scroll_blocks_on() const { return scroll_blocks_on_; }
 
   void set_did_scroll_callback(const base::Closure& callback) {
     did_scroll_callback_ = callback;
   }
 
-  void SetDrawCheckerboardForMissingTiles(bool checkerboard);
-  bool draw_checkerboard_for_missing_tiles() const {
-    return draw_checkerboard_for_missing_tiles_;
-  }
-
   void SetForceRenderSurface(bool force_render_surface);
   bool force_render_surface() const { return force_render_surface_; }
 
   gfx::Vector2dF ScrollDelta() const { return gfx::Vector2dF(); }
   gfx::ScrollOffset CurrentScrollOffset() const { return scroll_offset_; }
 
   void SetDoubleSided(bool double_sided);
   bool double_sided() const { return double_sided_; }
 
   void SetShouldFlattenTransform(bool flatten);
@@ skipping 376 matching lines @@
   bool is_root_for_isolated_group_ : 1;
   bool is_container_for_fixed_position_layers_ : 1;
   bool is_drawable_ : 1;
   bool draws_content_ : 1;
   bool hide_layer_and_subtree_ : 1;
   bool masks_to_bounds_ : 1;
   bool contents_opaque_ : 1;
   bool double_sided_ : 1;
   bool should_flatten_transform_ : 1;
   bool use_parent_backface_visibility_ : 1;
-  bool draw_checkerboard_for_missing_tiles_ : 1;
   bool force_render_surface_ : 1;
   bool transform_is_invertible_ : 1;
   bool has_render_surface_ : 1;
   ScrollBlocksOn scroll_blocks_on_ : 3;
   Region non_fast_scrollable_region_;
   Region touch_event_handler_region_;
   gfx::PointF position_;
   SkColor background_color_;
   float opacity_;
   SkXfermode::Mode blend_mode_;
@@ skipping 37 matching lines @@
 
   std::vector<FrameTimingRequest> frame_timing_requests_;
   bool frame_timing_requests_dirty_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_