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

content/browser/frame_host/render_widget_host_view_guest.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 "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/frame_host/render_widget_host_view_guest.h"
@@ skipping 357 matching lines @@
 
 void RenderWidgetHostViewGuest::CopyFromCompositingSurface(
     const gfx::Rect& src_subrect,
     const gfx::Size& dst_size,
     const base::Callback<void(bool, const SkBitmap&)>& callback,
     const SkBitmap::Config config) {
   CHECK(guest_);
   guest_->CopyFromCompositingSurface(src_subrect, dst_size, callback);
 }
 
-void RenderWidgetHostViewGuest::SetBackground(const SkBitmap& background) {
-  platform_view_->SetBackground(background);
+void RenderWidgetHostViewGuest::SetBackgroundOpaque(bool opaque) {
+  platform_view_->SetBackgroundOpaque(opaque);
 }
 
 void RenderWidgetHostViewGuest::SetScrollOffsetPinning(
     bool is_pinned_to_left, bool is_pinned_to_right) {
   platform_view_->SetScrollOffsetPinning(
       is_pinned_to_left, is_pinned_to_right);
 }
 
 bool RenderWidgetHostViewGuest::LockMouse() {
   return platform_view_->LockMouse();
@@ skipping 180 matching lines @@
   return SkBitmap::kARGB_8888_Config;
 }
 
 RenderWidgetHostViewBase*
 RenderWidgetHostViewGuest::GetGuestRenderWidgetHostView() const {
   return static_cast<RenderWidgetHostViewBase*>(
       guest_->GetEmbedderRenderWidgetHostView());
 }
 
 }  // namespace content