fix tab restore service crash

chrome/browser/sessions/tab_restore_service.h

 // Copyright (c) 2011 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_TAB_RESTORE_SERVICE_H_
 #define CHROME_BROWSER_SESSIONS_TAB_RESTORE_SERVICE_H_
 #pragma once
 
 #include <list>
 #include <set>
@@ skipping 159 matching lines @@
   // Creates and add entries to |entries| for each of the windows in |windows|.
   void CreateEntriesFromWindows(std::vector<SessionWindow*>* windows,
                                 std::vector<Entry*>* entries);
 
  protected:
   virtual void Save() OVERRIDE;
 
  private:
   friend class TabRestoreServiceTest;
   FRIEND_TEST_ALL_PREFIXES(TabRestoreServiceTest, PruneEntries);
+  FRIEND_TEST_ALL_PREFIXES(TabRestoreServiceTest, PruneIsCalled);
 
   // Used to indicate what has loaded.
   enum LoadState {
     // Indicates we haven't loaded anything.
     NOT_LOADED           = 1 << 0,
 
     // Indicates we've asked for the last sessions and tabs but haven't gotten
     // the result back yet.
     LOADING              = 1 << 2,
 
@@ skipping 165 matching lines @@
   // loading LoadStateChanged is invoked, which adds these entries to
   // entries_.
   std::vector<Entry*> staging_entries_;
 
   TimeFactory* time_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabRestoreService);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_TAB_RESTORE_SERVICE_H_