GTTF: Add missing virtual destructors.

chrome/browser/signin/signin_internals_util.h

 // Copyright (c) 2012 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_SIGNIN_SIGNIN_INTERNALS_UTIL_H_
 #define CHROME_BROWSER_SIGNIN_SIGNIN_INTERNALS_UTIL_H_
 
 #include <map>
 #include <string>
 
@@ skipping 121 matching lines @@
                                         const std::string& value) {}
 
   // Tokens and service related changes.
   virtual void NotifyTokenReceivedSuccess(const std::string& token_name,
                                           const std::string& token,
                                           bool update_time) {}
   virtual void NotifyTokenReceivedFailure(const std::string& token_name,
                                           const std::string& error) {}
   virtual void NotifyClearStoredToken(const std::string& token_name) {}
 
+ protected:
+  virtual ~SigninDiagnosticsObserver() {}
 };
 
 } // namespace
 
 #endif  // CHROME_BROWSER_SIGNIN_SIGNIN_INTERNALS_UTIL_H_