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

content/browser/renderer_host/render_widget_host_impl.cc

 // Copyright (c) 2012 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/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 #include <set>
 #include <utility>
 
@@ skipping 1956 matching lines @@
 }
 
 void RenderWidgetHostImpl::StartUserGesture() {
   OnUserGesture();
 }
 
 void RenderWidgetHostImpl::Stop() {
   Send(new ViewMsg_Stop(GetRoutingID()));
 }
 
-void RenderWidgetHostImpl::SetBackground(const SkBitmap& background) {
-  Send(new ViewMsg_SetBackground(GetRoutingID(), background));
+void RenderWidgetHostImpl::SetBackgroundOpaque(bool opaque) {
+  Send(new ViewMsg_SetBackgroundOpaque(GetRoutingID(), opaque));
 }
 
 void RenderWidgetHostImpl::SetEditCommandsForNextKeyEvent(
     const std::vector<EditCommand>& commands) {
   Send(new InputMsg_SetEditCommandsForNextKeyEvent(GetRoutingID(), commands));
 }
 
 void RenderWidgetHostImpl::AddAccessibilityMode(AccessibilityMode mode) {
   SetAccessibilityMode(
       content::AddAccessibilityModeTo(accessibility_mode_, mode));
@@ skipping 356 matching lines @@
   }
 }
 
 SkBitmap::Config RenderWidgetHostImpl::PreferredReadbackFormat() {
   if (view_)
     return view_->PreferredReadbackFormat();
   return SkBitmap::kARGB_8888_Config;
 }
 
 }  // namespace content