Makes instant run before unload listeners.

chrome/browser/sessions/session_id.h

 // Copyright (c) 2006-2008 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_SESSIONS_SESSION_ID_H_
 #define CHROME_BROWSER_SESSIONS_SESSION_ID_H_
 #pragma once
 
 #include "base/basictypes.h"
 
@@ skipping 10 matching lines @@
 
   // Returns the underlying id.
   id_type id() const { return id_; }
 
  private:
   friend class NavigationController;
   friend class SessionService;
 
   explicit SessionID(id_type id) : id_(id) {}
 
-  // Resets the ID to 0.
-  void clear() { id_ = 0; }
-
   // Resets the id. This is used when restoring a session
   void set_id(id_type id) { id_ = id; }
 
   id_type id_;
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_SESSION_ID_H_