Create GoogleURLTrackerClient interface and //chrome implementation

chrome/browser/google/google_url_tracker_navigation_helper_impl.h

 // Copyright (c) 2012 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 CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_IMPL_H_
 #define CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_IMPL_H_
 
 #include "chrome/browser/google/google_url_tracker_navigation_helper.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "url/gurl.h"
 
 class GoogleURLTrackerNavigationHelperImpl
     : public GoogleURLTrackerNavigationHelper,
       public content::NotificationObserver {
  public:
   explicit GoogleURLTrackerNavigationHelperImpl();
   virtual ~GoogleURLTrackerNavigationHelperImpl();
 
   // GoogleURLTrackerNavigationHelper.
   virtual void SetGoogleURLTracker(GoogleURLTracker* tracker) OVERRIDE;
-  virtual void SetListeningForNavigationStart(bool listen) OVERRIDE;
-  virtual bool IsListeningForNavigationStart() OVERRIDE;
   virtual void SetListeningForNavigationCommit(
       const content::NavigationController* nav_controller,
       bool listen) OVERRIDE;
   virtual bool IsListeningForNavigationCommit(
       const content::NavigationController* nav_controller) OVERRIDE;
   virtual void SetListeningForTabDestruction(
       const content::NavigationController* nav_controller,
       bool listen) OVERRIDE;
   virtual bool IsListeningForTabDestruction(
       const content::NavigationController* nav_controller) OVERRIDE;
 
  private:
-  friend class GoogleURLTrackerNavigationHelperTest;
-
   // content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Returns a WebContents NavigationSource for the WebContents corresponding to
   // the given NavigationController NotificationSource.
   virtual content::NotificationSource GetWebContentsSource(
       const content::NotificationSource& nav_controller_source);
 
   GoogleURLTracker* tracker_;
   content::NotificationRegistrar registrar_;
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_IMPL_H_