Add OVERRIDE to webkit/.

webkit/plugins/npapi/test/plugin_private_test.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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 WEBKIT_PLUGINS_NPAPI_TEST_PLUGIN_PRIVATE_TEST_H_
 #define WEBKIT_PLUGINS_NPAPI_TEST_PLUGIN_PRIVATE_TEST_H_
 
+#include "base/compiler_specific.h"
 #include "webkit/plugins/npapi/test/plugin_test.h"
 
 namespace NPAPIClient {
 
 // The PluginPrivateTest tests that a plugin can query if the browser is in
 // private browsing mode.
 class PrivateTest : public PluginTest {
  public:
   PrivateTest(NPP id, NPNetscapeFuncs *host_functions);
 
   // Initialize this PluginTest based on the arguments from NPP_New.
   virtual NPError New(uint16 mode, int16 argc, const char* argn[],
-                      const char* argv[], NPSavedData* saved);
+                      const char* argv[], NPSavedData* saved) OVERRIDE;
 };
 
 }  // namespace NPAPIClient
 
 #endif  // WEBKIT_PLUGINS_NPAPI_TEST_PLUGIN_PRIVATE_TEST_H_