Extract minimal RenderViewHost interface for embedders, leaving

content/browser/renderer_host/render_view_host_factory.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_view_host_factory.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/render_view_host.h"
 
 using content::SessionStorageNamespace;
 using content::SiteInstance;
 
 // static
 RenderViewHostFactory* RenderViewHostFactory::factory_ = NULL;
 
 // static
 RenderViewHost* RenderViewHostFactory::Create(
     SiteInstance* instance,
     content::RenderViewHostDelegate* delegate,
     int routing_id,
     SessionStorageNamespace* session_storage_namespace) {
   if (factory_) {
     return factory_->CreateRenderViewHost(instance, delegate, routing_id,
                                           session_storage_namespace);
   }
-  return new RenderViewHost(instance, delegate, routing_id,
-                            session_storage_namespace);
+  return new RenderViewHostImpl(instance, delegate, routing_id,
+                                session_storage_namespace);
 }
 
 // static
 void RenderViewHostFactory::RegisterFactory(RenderViewHostFactory* factory) {
   DCHECK(!factory_) << "Can't register two factories at once.";
   factory_ = factory;
 }
 
 // static
 void RenderViewHostFactory::UnregisterFactory() {
   DCHECK(factory_) << "No factory to unregister.";
   factory_ = NULL;
 }