Move NPAPI test plugin to content/test/plugin.

content/test/plugin/plugin_test.h

 // 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_TEST_H_
-#define WEBKIT_PLUGINS_NPAPI_TEST_PLUGIN_TEST_H_
+#ifndef CONTENT_TEST_PLUGIN_PLUGIN_TEST_H_
+#define CONTENT_TEST_PLUGIN_PLUGIN_TEST_H_
 
 #include <string>
 
 #include "third_party/npapi/bindings/npapi.h"
 #include "third_party/npapi/bindings/nphostapi.h"
 
 namespace NPAPIClient {
 
 // A PluginTest represents an instance of the plugin, which in
 // our case is a test case.
@@ skipping 77 matching lines @@
   NPP                       id_;
   NPNetscapeFuncs *         host_functions_;
   std::string               test_name_;
   std::string               test_id_;
   std::string               test_status_;
   bool                      test_completed_;
 };
 
 }  // namespace NPAPIClient
 
-#endif  // WEBKIT_PLUGINS_NPAPI_TEST_PLUGIN_TEST_H_
+#endif  // CONTENT_TEST_PLUGIN_PLUGIN_TEST_H_