Remove --background-color-instead-of-checkerboard flag.

cc/layers/layer_impl.h

 // Copyright 2011 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_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 407 matching lines @@
   void SetTouchEventHandlerRegion(const Region& region) {
     touch_event_handler_region_ = region;
   }
   const Region& touch_event_handler_region() const {
     return touch_event_handler_region_;
   }
 
   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
     draw_checkerboard_for_missing_tiles_ = checkerboard;
   }
-  bool DrawCheckerboardForMissingTiles() const;
+  bool draw_checkerboard_for_missing_tiles() const {
+    return draw_checkerboard_for_missing_tiles_;
+  }
 
   InputHandler::ScrollStatus TryScroll(
       const gfx::PointF& screen_space_point,
       InputHandler::ScrollInputType type) const;
 
   void SetDoubleSided(bool double_sided);
   bool double_sided() const { return double_sided_; }
 
   void SetTransform(const gfx::Transform& transform);
   const gfx::Transform& transform() const { return transform_; }
@@ skipping 221 matching lines @@
   DrawProperties<LayerImpl> draw_properties_;
 
   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_