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

content/child/npapi/npobject_base.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.
 //
 // Base interface used by NPChannelBase and implemented by NPObjectProxy and
 // NPObjectStub.
 
-#ifndef CONTENT_CHILD_NPOBJECT_BASE_H_
-#define CONTENT_CHILD_NPOBJECT_BASE_H_
+#ifndef CONTENT_CHILD_NPAPI_NPOBJECT_BASE_H_
+#define CONTENT_CHILD_NPAPI_NPOBJECT_BASE_H_
 
 #include "ipc/ipc_listener.h"
 #include "third_party/npapi/bindings/npruntime.h"
 
 struct NPObject;
 
 namespace content {
 
 class NPObjectBase {
  public:
   virtual ~NPObjectBase() {}
 
   // Returns the underlying NPObject handled by this NPObjectBase instance.
   virtual NPObject* GetUnderlyingNPObject() = 0;
 
   // Returns the channel listener for this NPObjectBase instance.
   virtual IPC::Listener* GetChannelListener() = 0;
 };
 
 }  // namespace content
 
-#endif  // CONTENT_CHILD_NPOBJECT_BASE_H_
+#endif  // CONTENT_CHILD_NPAPI_NPOBJECT_BASE_H_