Cleanup: Fix content header include guards.

content/test/plugin/plugin_windowed_test.h

 // Copyright (c) 2010 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 CONTENT_TEST_PLUGIN_PLUGIN_WINDOWED_TEST_H
-#define CONTENT_TEST_PLUGIN_PLUGIN_WINDOWED_TEST_H
+#ifndef CONTENT_TEST_PLUGIN_PLUGIN_WINDOWED_TEST_H_
+#define CONTENT_TEST_PLUGIN_PLUGIN_WINDOWED_TEST_H_
 
 #include "content/test/plugin/plugin_test.h"
 
 namespace NPAPIClient {
 
 // This class contains a list of windowed plugin tests. Please add additional
 // tests to this class.
 class WindowedPluginTest : public PluginTest {
  public:
   WindowedPluginTest(NPP id, NPNetscapeFuncs *host_functions);
   ~WindowedPluginTest();
 
  private:
   static LRESULT CALLBACK WindowProc(
       HWND window, UINT message, WPARAM wparam, LPARAM lparam);
   static void CallJSFunction(WindowedPluginTest*, const char*);
 
   virtual NPError SetWindow(NPWindow* pNPWindow);
   virtual NPError Destroy();
 
   HWND window_;
   bool done_;
 };
 
 }  // namespace NPAPIClient
 
-#endif  // CONTENT_TEST_PLUGIN_PLUGIN_WINDOWED_TEST_H
+#endif  // CONTENT_TEST_PLUGIN_PLUGIN_WINDOWED_TEST_H_