Add OVERRIDE to webkit/.

webkit/plugins/npapi/test/plugin_javascript_open_popup.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_JAVASCRIPT_OPEN_POPUP_H_
 #define WEBKIT_PLUGINS_NPAPI_TEST_PLUGIN_JAVASCRIPT_OPEN_POPUP_H_
 
+#include "base/compiler_specific.h"
 #include "webkit/plugins/npapi/test/plugin_test.h"
 
 namespace NPAPIClient {
 
 // This class tests the case where a windowed plugin instance is
 // instantiated in a popup window. The plugin instance needs to
 // have a valid parent window.
 class ExecuteJavascriptOpenPopupWithPluginTest : public PluginTest {
  public:
   // Constructor.
   ExecuteJavascriptOpenPopupWithPluginTest(
       NPP id, NPNetscapeFuncs *host_functions);
   // NPAPI SetWindow handler.
-  virtual NPError SetWindow(NPWindow* window);
+  virtual NPError SetWindow(NPWindow* window) OVERRIDE;
 
  private:
   bool popup_window_test_started_;
 };
 
 // This class represents a windowed plugin instance instantiated within a
 // popup window. It verifies that the plugin instance has a valid parent.
 class ExecuteJavascriptPopupWindowTargetPluginTest : public PluginTest {
  public:
   ExecuteJavascriptPopupWindowTargetPluginTest(
       NPP id, NPNetscapeFuncs *host_functions);
   // NPAPI SetWindow handler.
-  virtual NPError SetWindow(NPWindow* window);
+  virtual NPError SetWindow(NPWindow* window) OVERRIDE;
 
  private:
   // Do a platform-specific validation of the passed-in |window|.
   // E.g. on Windows, verifies window->window is a reasonable HWND.
   // Returns true if the test should be marked complete.
   bool CheckWindow(NPWindow* window);
 
   bool test_completed_;
 };
 
 }  // namespace NPAPIClient
 
 #endif // WEBKIT_PLUGINS_NPAPI_TEST_PLUGIN_JAVASCRIPT_OPEN_POPUP_H_