Move the Remoting Host plugin into its own sub-directory.

remoting/host/plugin/host_plugin_utils.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 REMOTING_HOST_HOST_PLUGIN_UTILS_H_
-#define REMOTING_HOST_HOST_PLUGIN_UTILS_H_
+#ifndef REMOTING_HOST_PLUGIN_HOST_PLUGIN_UTILS_H_
+#define REMOTING_HOST_PLUGIN_HOST_PLUGIN_UTILS_H_
 
 #include <string>
 
 #include "third_party/npapi/bindings/npapi.h"
 #include "third_party/npapi/bindings/npfunctions.h"
 #include "third_party/npapi/bindings/npruntime.h"
 
 namespace remoting {
 
 // Global netscape functions initialized in NP_Initialize.
 extern NPNetscapeFuncs* g_npnetscape_funcs;
 
 // Convert an NPIdentifier into a std::string.
 std::string StringFromNPIdentifier(NPIdentifier identifier);
 
 // Convert an NPVariant into a std::string.
 std::string StringFromNPVariant(const NPVariant& variant);
 
 // Convert a std::string into an NPVariant.
 // Caller is responsible for making sure that NPN_ReleaseVariantValue is
 // called on returned value.
 NPVariant NPVariantFromString(const std::string& val);
 
 // Convert an NPVariant into an NSPObject.
 NPObject* ObjectFromNPVariant(const NPVariant& variant);
 
 }  // namespace remoting
 
-#endif  // REMOTING_HOST_HOST_PLUGIN_UTILS_H_
+#endif  // REMOTING_HOST_PLUGIN_HOST_PLUGIN_UTILS_H_