GTTF: Add missing virtual destructors.

chrome/browser/extensions/extension_function.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_EXTENSIONS_EXTENSION_FUNCTION_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_
 
 #include <list>
 #include <string>
 
@@ skipping 251 matching lines @@
 // Extension functions that run on the UI thread. Most functions fall into
 // this category.
 class UIThreadExtensionFunction : public ExtensionFunction {
  public:
   // A delegate for use in testing, to intercept the call to SendResponse.
   class DelegateForTests {
    public:
     virtual void OnSendResponse(UIThreadExtensionFunction* function,
                                 bool success,
                                 bool bad_message) = 0;
+
+   protected:
+    virtual ~DelegateForTests() { }
   };
 
   UIThreadExtensionFunction();
 
   virtual UIThreadExtensionFunction* AsUIThreadExtensionFunction() OVERRIDE;
 
   void set_test_delegate(DelegateForTests* delegate) {
     delegate_ = delegate;
   }
 
@@ skipping 188 matching lines @@
  public:
   SyncIOThreadExtensionFunction();
 
   virtual void Run() OVERRIDE;
 
  protected:
   virtual ~SyncIOThreadExtensionFunction();
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FUNCTION_H_