Remove RenderWidget::SetBackground, change IPC to pass a bool.

content/browser/frame_host/render_widget_host_view_child_frame.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 "content/browser/frame_host/render_widget_host_view_child_frame.h"
 
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/view_messages.h"
@@ skipping 68 matching lines @@
   NOTREACHED();
   return 0;
 }
 
 gfx::NativeViewAccessible
 RenderWidgetHostViewChildFrame::GetNativeViewAccessible() {
   NOTREACHED();
   return NULL;
 }
 
-void RenderWidgetHostViewChildFrame::SetBackground(
-    const SkBitmap& background) {
+void RenderWidgetHostViewChildFrame::SetBackgroundOpaque(bool opaque) {
 }
 
 gfx::Size RenderWidgetHostViewChildFrame::GetPhysicalBackingSize() const {
   gfx::Size size;
   if (frame_connector_)
     size = frame_connector_->ChildFrameRect().size();
   return size;
 }
 
 void RenderWidgetHostViewChildFrame::InitAsPopup(
@@ skipping 244 matching lines @@
     const {
   return NULL;
 }
 #endif // defined(OS_WIN)
 
 SkBitmap::Config RenderWidgetHostViewChildFrame::PreferredReadbackFormat() {
   return SkBitmap::kARGB_8888_Config;
 }
 
 }  // namespace content