Remove support for custom overscroll background

content/renderer/gpu/render_widget_compositor.cc

 // Copyright (c) 2013 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 "content/renderer/gpu/render_widget_compositor.h"
 
 #include <limits>
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 565 matching lines @@
 }
 
 void RenderWidgetCompositor::setBackgroundColor(blink::WebColor color) {
   layer_tree_host_->set_background_color(color);
 }
 
 void RenderWidgetCompositor::setHasTransparentBackground(bool transparent) {
   layer_tree_host_->set_has_transparent_background(transparent);
 }
 
-void RenderWidgetCompositor::setOverhangBitmap(const SkBitmap& bitmap) {
-  layer_tree_host_->SetOverhangBitmap(bitmap);
-}
-
 void RenderWidgetCompositor::setVisible(bool visible) {
   layer_tree_host_->SetVisible(visible);
 }
 
 void RenderWidgetCompositor::setPageScaleFactorAndLimits(
     float page_scale_factor, float minimum, float maximum) {
   layer_tree_host_->SetPageScaleFactorAndLimits(
       page_scale_factor, minimum, maximum);
 }
 
@@ skipping 270 matching lines @@
   widget_->OnSwapBuffersAborted();
 }
 
 void RenderWidgetCompositor::RateLimitSharedMainThreadContext() {
   cc::ContextProvider* provider =
       compositor_deps_->GetSharedMainThreadContextProvider();
   provider->ContextGL()->RateLimitOffscreenContextCHROMIUM();
 }
 
 }  // namespace content