Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/renderer_host/render_frame_host_impl.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_FRAME_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_FRAME_HOST_IMPL_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "content/public/browser/render_frame_host.h"
 
 namespace content {
 
 class FrameTree;
+class Navigator;
 class RenderProcessHost;
 class RenderViewHostImpl;
+class SiteInstance;
 
 class CONTENT_EXPORT RenderFrameHostImpl : public RenderFrameHost {
  public:
   static RenderFrameHostImpl* FromID(int process_id, int routing_id);
 
   // TODO(nasko): Remove dependency on RenderViewHost here. RenderProcessHost
   // should be the abstraction needed here, but we need RenderViewHost to pass
   // into WebContentsObserver::FrameDetached for now.
   RenderFrameHostImpl(RenderViewHostImpl* render_view_host,
                       FrameTree* frame_tree,
                       int routing_id,
                       bool is_swapped_out);
   virtual ~RenderFrameHostImpl();
 
   // IPC::Sender
   virtual bool Send(IPC::Message* msg) OVERRIDE;
 
   // IPC::Listener
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 
+  // RenderFrameHost
+  virtual RenderProcessHost* GetProcess() const OVERRIDE;
+  virtual SiteInstance* GetSiteInstance() const OVERRIDE;
+
   void Init();
-  RenderProcessHost* GetProcess() const;
   int routing_id() const { return routing_id_; }
   void OnCreateChildFrame(int new_frame_routing_id,
                           int64 parent_frame_id,
                           int64 frame_id,
                           const std::string& frame_name);
 
   RenderViewHostImpl* render_view_host() {
     return render_view_host_;
   }
 
  private:
   bool is_swapped_out() { return is_swapped_out_; }
 
   // IPC message handlers.
   void OnDetach(int64 parent_frame_id, int64 frame_id);
 
   // TODO(nasko): This should be removed and replaced by RenderProcessHost.
   RenderViewHostImpl* render_view_host_;  // Not owned.
 
   // Reference to the whole frame tree that this RenderFrameHost belongs too.
   // Allows this RenderFrameHost to add and remove nodes in response to
   // messages from the renderer requesting DOM manipulation.
   FrameTree* frame_tree_;
+
+  // The Navigator object allows the RenderFrameHost to perform navigations
+  // in its own frame in the frame tree. The Navigator is owned by FrameTree.
+  Navigator* navigator_;
+
   int routing_id_;
   bool is_swapped_out_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_FRAME_HOST_IMPL_H_