Revert "Fix a ton of compiler warnings."

chrome/browser/sessions/tab_restore_service.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// 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_TAB_RESTORE_SERVICE_H_
 #define CHROME_BROWSER_SESSIONS_TAB_RESTORE_SERVICE_H_
 
 #include <list>
 #include <vector>
 
 #include "base/observer_list.h"
@@ skipping 22 matching lines @@
   // Observer is notified when the set of entries managed by TabRestoreService
   // changes in some way.
   class Observer {
    public:
     // Sent when the set of entries changes in some way.
     virtual void TabRestoreServiceChanged(TabRestoreService* service) = 0;
 
     // Sent to all remaining Observers when TabRestoreService's
     // destructor is run.
     virtual void TabRestoreServiceDestroyed(TabRestoreService* service) = 0;
-
-   protected:
-    ~Observer() {}
   };
 
   // Interface used to allow the test to provide a custom time.
   class TimeFactory {
    public:
     virtual ~TimeFactory() {}
     virtual base::Time TimeNow() = 0;
   };
 
   // The type of entry.
@@ skipping 269 matching lines @@
   // entries_.
   std::vector<Entry*> staging_entries_;
 
   TimeFactory* time_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TabRestoreService);
 };
 
 #endif  // CHROME_BROWSER_SESSIONS_TAB_RESTORE_SERVICE_H_