Move core pieces of browser\renderer_host to src\content.

chrome/browser/renderer_host/render_view_host_factory.cc

-// Copyright (c) 2009 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 "chrome/browser/renderer_host/render_view_host_factory.h"
-
-#include "base/logging.h"
-#include "chrome/browser/renderer_host/render_view_host.h"
-
-// static
-RenderViewHostFactory* RenderViewHostFactory::factory_ = NULL;
-
-// static
-RenderViewHost* RenderViewHostFactory::Create(
-    SiteInstance* instance,
-    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);
-}
-
-// 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;
-}