Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/frame_host/navigator.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_FRAME_HOST_NAVIGATOR_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
 
+class GURL;
+
 namespace content {
 
 class NavigationControllerImpl;
 class NavigatorDelegate;
+class RenderFrameHostImpl;
 
 // Implementations of this interface are responsible for performing navigations
 // in a node of the FrameTree. Its lifetime is bound to all FrameTreeNode
 // objects that are using it and will be released once all nodes that use it are
 // freed. The Navigator is bound to a single frame tree and cannot be used by
 // multiple instances of FrameTree.
 // TODO(nasko): Move all navigation methods, such as didStartProvisionalLoad
 // from WebContentsImpl to this interface.
 class CONTENT_EXPORT Navigator : public base::RefCounted<Navigator> {
  public:
+  // The RenderFrameHostImpl started a provisional load.
+  virtual void DidStartProvisionalLoad(RenderFrameHostImpl* render_frame_host,
+                                       int64 frame_id,
+                                       int64 parent_frame_id,
+                                       bool main_frame,
+                                       const GURL& url) {};
 
  protected:
   friend class base::RefCounted<Navigator>;
   virtual ~Navigator() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_H_