Move npapi related files from content\child to the new content\child\npapi directory.

content/child/npapi/npobject_stub.h

 // Copyright 2013 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.
 //
 // A class that receives IPC messages from an NPObjectProxy and calls the real
 // NPObject.
 
-#ifndef CONTENT_CHILD_NPOBJECT_STUB_H_
-#define CONTENT_CHILD_NPOBJECT_STUB_H_
+#ifndef CONTENT_CHILD_NPAPI_NPOBJECT_STUB_H_
+#define CONTENT_CHILD_NPAPI_NPOBJECT_STUB_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
-#include "content/child/npobject_base.h"
+#include "content/child/npapi/npobject_base.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "url/gurl.h"
 
 struct NPObject;
 
 namespace content {
 class NPChannelBase;
 struct NPIdentifier_Param;
 struct NPVariant_Param;
@@ skipping 63 matching lines @@
   scoped_refptr<NPChannelBase> channel_;
   int route_id_;
   int render_view_id_;
 
   // The url of the main frame hosting the plugin.
   GURL page_url_;
 };
 
 }  // namespace content
 
-#endif  // CONTENT_CHILD_NPOBJECT_STUB_H_
+#endif  // CONTENT_CHILD_NPAPI_NPOBJECT_STUB_H_