Revert "Fix a ton of compiler warnings."

chrome/browser/sessions/tab_restore_service.h

Index: chrome/browser/sessions/tab_restore_service.h
diff --git a/chrome/browser/sessions/tab_restore_service.h b/chrome/browser/sessions/tab_restore_service.h
index 5e980e479d87902e898f4f45db1e021bf6c2b165..a3e611c6eecc62d7520d5fc2ec0403f97ffc7fc3 100644
--- a/chrome/browser/sessions/tab_restore_service.h
+++ b/chrome/browser/sessions/tab_restore_service.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -41,9 +41,6 @@ class TabRestoreService : public BaseSessionService {
     // 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.