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

cc/blink/web_content_layer_impl.cc

 // Copyright 2014 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.
 
 #include "cc/blink/web_content_layer_impl.h"
 
 #include "cc/blink/web_display_item_list_impl.h"
 #include "cc/layers/picture_layer.h"
 #include "cc/playback/display_item_list_settings.h"
 #include "third_party/WebKit/public/platform/WebContentLayerClient.h"
@@ skipping 37 matching lines @@
 
 blink::WebLayer* WebContentLayerImpl::layer() {
   return layer_.get();
 }
 
 void WebContentLayerImpl::setDoubleSided(bool double_sided) {
   layer_->layer()->SetDoubleSided(double_sided);
 }
 
 void WebContentLayerImpl::setDrawCheckerboardForMissingTiles(bool enable) {
-  layer_->layer()->SetDrawCheckerboardForMissingTiles(enable);
 }
 
 void WebContentLayerImpl::PaintContents(
     SkCanvas* canvas,
     const gfx::Rect& clip,
     cc::ContentLayerClient::PaintingControlSetting painting_control) {
   if (!client_)
     return;
 
   client_->paintContents(canvas, clip, PaintingControlToWeb(painting_control));
@@ skipping 18 matching lines @@
 
 bool WebContentLayerImpl::FillsBoundsCompletely() const {
   return false;
 }
 
 size_t WebContentLayerImpl::GetApproximateUnsharedMemoryUsage() const {
   return client_->approximateUnsharedMemoryUsage();
 }
 
 }  // namespace cc_blink