Move out DidStartProvisionalLoad from WebContentsImpl into Navigator.

content/browser/frame_host/navigator_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_FRAME_HOST_NAVIGATOR_IMPL_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/browser/frame_host/navigator.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 class NavigationControllerImpl;
 class NavigatorDelegate;
 
 // This class is an implementation of Navigator, responsible for managing
 // navigations in regular browser tabs.
 class CONTENT_EXPORT NavigatorImpl : public Navigator {
  public:
   NavigatorImpl(NavigationControllerImpl* navigation_controller,
                 NavigatorDelegate* delegate);
 
+  // Navigator implementation.
+  virtual void DidStartProvisionalLoad(RenderFrameHostImpl* render_frame_host,
+                                       int64 frame_id,
+                                       int64 parent_frame_id,
+                                       bool main_frame,
+                                       const GURL& url) OVERRIDE;
+
  private:
   virtual ~NavigatorImpl() {}
 
+  // The NavigationController that will keep track of session history for all
+  // RenderFrameHost objects using this NavigatorImpl.
+  // TODO(nasko): Move ownership of the NavigationController from
+  // WebContentsImpl to this class.
+  NavigationControllerImpl* controller_;
+
+  // Used to notify the object embedding this Navigator about navigation
+  // events. Can be NULL in tests.
+  NavigatorDelegate* delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(NavigatorImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_IMPL_H_