Ensure fullscreen mode is exited for same-site navigations.

content/browser/frame_host/navigator_delegate.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_DELEGATE_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_
 
 #include "base/strings/string16.h"
 #include "content/public/browser/invalidate_type.h"
 #include "content/public/browser/navigation_controller.h"
@@ skipping 41 matching lines @@
       const GURL& validated_target_url) {}
 
   // A navigation was committed in |render_frame_host|.
   virtual void DidCommitProvisionalLoad(
       RenderFrameHostImpl* render_frame_host,
       const base::string16& frame_unique_name,
       bool is_main_frame,
       const GURL& url,
       PageTransition transition_type) {}
 
+  // Handles post-navigation tasks in navigation BEFORE the entry has been
+  // committed to the NavigationController.
+  virtual void DidNavigateMainFramePreCommit(
+      const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {}
+
   // Handles post-navigation tasks in navigation AFTER the entry has been
   // committed to the NavigationController. Note that the NavigationEntry is
   // not provided since it may be invalid/changed after being committed. The
   // NavigationController's last committed entry is for this navigation.
   virtual void DidNavigateMainFramePostCommit(
       const LoadCommittedDetails& details,
       const FrameHostMsg_DidCommitProvisionalLoad_Params& params) {}
   virtual void DidNavigateAnyFramePostCommit(
       RenderFrameHostImpl* render_frame_host,
       const LoadCommittedDetails& details,
@@ skipping 20 matching lines @@
 
   // Opens a URL with the given parameters. See PageNavigator::OpenURL, which
   // this forwards to.
   virtual void RequestOpenURL(RenderFrameHostImpl* render_frame_host,
                               const OpenURLParams& params) {}
 };
 
 }  // namspace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATOR_DELEGATE_H_