Remove the use of ProvisionalChangeToMainFrameUrl from supervised user code.

chrome/browser/supervised_user/supervised_user_navigation_observer.h

 // Copyright 2014 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_SUPERVISED_USER_SUPERVISED_USER_NAVIGATION_OBSERVER_H_
 #define CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_NAVIGATION_OBSERVER_H_
 
 #include <set>
 #include <vector>
 
@@ skipping 33 matching lines @@
                                int render_view_id,
                                const GURL& url,
                                const base::Callback<void(bool)>& callback);
 
  private:
   friend class content::WebContentsUserData<SupervisedUserNavigationObserver>;
 
   explicit SupervisedUserNavigationObserver(content::WebContents* web_contents);
 
   // content::WebContentsObserver implementation.
-  virtual void ProvisionalChangeToMainFrameUrl(
-      const GURL& url,
-      content::RenderFrameHost* render_frame_host) OVERRIDE;
   virtual void DidCommitProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& url,
       content::PageTransition transition_type) OVERRIDE;
 
   void OnRequestBlockedInternal(const GURL& url);
 
   // Owned by the profile, so outlives us.
   SupervisedUserService* supervised_user_service_;
 
   // Owned by SupervisedUserService.
   const SupervisedUserURLFilter* url_filter_;
 
   // Owned by the InfoBarService, which has the same lifetime as this object.
   infobars::InfoBar* warn_infobar_;
 
   ScopedVector<const content::NavigationEntry> blocked_navigations_;
 
   DISALLOW_COPY_AND_ASSIGN(SupervisedUserNavigationObserver);
 };
 
 #endif  // CHROME_BROWSER_SUPERVISED_USER_SUPERVISED_USER_NAVIGATION_OBSERVER_H_