Extract minimal RenderViewHost interface for embedders, leaving

content/public/browser/web_contents_observer.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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/public/browser/web_contents_observer.h"
 
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/public/browser/navigation_details.h"
 
 namespace content {
@@ skipping 28 matching lines @@
 bool WebContentsObserver::OnMessageReceived(const IPC::Message& message) {
   return false;
 }
 
 bool WebContentsObserver::Send(IPC::Message* message) {
   if (!tab_contents_ || !tab_contents_->GetRenderViewHost()) {
     delete message;
     return false;
   }
 
-  return tab_contents_->GetRenderViewHost()->Send(message);
+  return static_cast<RenderViewHostImpl*>(
+      tab_contents_->GetRenderViewHost())->Send(message);
 }
 
 int WebContentsObserver::routing_id() const {
   if (!tab_contents_ || !tab_contents_->GetRenderViewHost())
     return MSG_ROUTING_NONE;
 
-  return tab_contents_->GetRenderViewHost()->routing_id();
+  return tab_contents_->GetRenderViewHost()->GetRoutingID();
 }
 
 void WebContentsObserver::TabContentsDestroyed() {
   // Do cleanup so that 'this' can safely be deleted from WebContentsDestroyed.
   tab_contents_->RemoveObserver(this);
   TabContents* tab = tab_contents_;
   tab_contents_ = NULL;
   WebContentsDestroyed(tab);
 }
 
 }  // namespace content