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

content/browser/browser_plugin/browser_plugin_guest.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/browser_plugin/browser_plugin_guest.h"
 
 #include <algorithm>
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_util.h"
@@ skipping 1350 matching lines @@
 
 void BrowserPluginGuest::OnSetEditCommandsForNextKeyEvent(
     int instance_id,
     const std::vector<EditCommand>& edit_commands) {
   Send(new InputMsg_SetEditCommandsForNextKeyEvent(routing_id(),
                                                    edit_commands));
 }
 
 void BrowserPluginGuest::OnSetContentsOpaque(int instance_id, bool opaque) {
   guest_opaque_ = opaque;
-
-  SkBitmap background;
-  if (!guest_opaque_) {
-    background.setConfig(SkBitmap::kARGB_8888_Config, 1, 1);
-    unsigned int color = 0;
-    background.setPixels(&color);
-  }
-  Send(new ViewMsg_SetBackground(routing_id(), background));
+  Send(new ViewMsg_SetBackgroundOpaque(routing_id(), guest_opaque_));
 }
 
 void BrowserPluginGuest::OnSetVisibility(int instance_id, bool visible) {
   guest_visible_ = visible;
   if (embedder_visible_ && guest_visible_)
     GetWebContents()->WasShown();
   else
     GetWebContents()->WasHidden();
 }
 
@@ skipping 158 matching lines @@
     const GURL& url) {
   if (!url.is_valid()) {
     callback.Run(false);
     return;
   }
 
   delegate_->CanDownload(request_method, url, callback);
 }
 
 }  // namespace content