Extract minimal RenderViewHost interface for embedders, leaving

content/public/browser/render_view_host_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/render_view_host_observer.h"
 
 #include "content/browser/renderer_host/render_view_host.h"
 
 namespace content {
 
 RenderViewHostObserver::RenderViewHostObserver(RenderViewHost* render_view_host)
-    : render_view_host_(render_view_host),
-      routing_id_(render_view_host->routing_id()) {
+    : render_view_host_(static_cast<RenderViewHostImpl*>(render_view_host)),
+      routing_id_(render_view_host_->GetRoutingID()) {
   render_view_host_->AddObserver(this);
 }
 
 RenderViewHostObserver::~RenderViewHostObserver() {
   if (render_view_host_)
     render_view_host_->RemoveObserver(this);
 }
 
 void RenderViewHostObserver::RenderViewHostInitialized() {
 }
@@ skipping 11 matching lines @@
 
 bool RenderViewHostObserver::Send(IPC::Message* message) {
   if (!render_view_host_) {
     delete message;
     return false;
   }
 
   return render_view_host_->Send(message);
 }
 
+RenderViewHost* RenderViewHostObserver::render_view_host() const {
+  return render_view_host_;
+}
+
 void RenderViewHostObserver::RenderViewHostDestruction() {
   render_view_host_->RemoveObserver(this);
   RenderViewHost* rvh = render_view_host_;
   render_view_host_ = NULL;
   RenderViewHostDestroyed(rvh);
 }
 
 }  // namespace content