Move NPAPI test plugin to content/test/plugin.

content/test/plugin/plugin_windowless_test.cc

 // 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.
 
 #define STRSAFE_NO_DEPRECATE
 
-#include "webkit/plugins/npapi/test/plugin_windowless_test.h"
+#include "content/test/plugin/plugin_windowless_test.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
-#include "webkit/plugins/npapi/test/plugin_client.h"
+#include "content/test/plugin/plugin_client.h"
 
 #if defined(TOOLKIT_GTK)
 #include <gdk/gdkx.h>
 #endif
 
 // NPEvent does not exist on the Mac.
 #if defined(OS_MACOSX)
 typedef NPCocoaEvent WindowlessPluginTestEvent;
 #else
 typedef NPEvent WindowlessPluginTestEvent;
@@ skipping 290 matching lines @@
     error_string.append(StringForPoint(flipped_window_x, flipped_window_y));
     SetError(error_string);
   }
 #else
   SetError("Unimplemented");
 #endif
   SignalTestCompleted();
 }
 
 }  // namespace NPAPIClient