Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/public/browser/render_frame_host.h

Index: content/public/browser/render_frame_host.h
diff --git a/content/public/browser/render_frame_host.h b/content/public/browser/render_frame_host.h
index 9b6344f3bae54ec65a6bffd35bc7e62a51d92871..6a563895fc2acc1c982ddeaab1210c6a1cafa917 100644
--- a/content/public/browser/render_frame_host.h
+++ b/content/public/browser/render_frame_host.h
@@ -11,12 +11,19 @@
 
 namespace content {
 
+class RenderProcessHost;
+class SiteInstance;
+
 // The interface provides a communication conduit with a frame in the renderer.
 class CONTENT_EXPORT RenderFrameHost : public IPC::Listener,
                                        public IPC::Sender {
  public:
   virtual ~RenderFrameHost() {}
 
+  virtual RenderProcessHost* GetProcess() const = 0;
+
+  virtual SiteInstance* GetSiteInstance() const = 0;
+
  private:
   // This interface should only be implemented inside content.
   friend class RenderFrameHostImpl;