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

remoting/host/plugin/host_plugin.cc

 // 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.
 
 #include <stdio.h>
 #include <string.h>
 
 #include <string>
 #include <vector>
 
 #include "base/at_exit.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/stringize_macros.h"
-#include "remoting/host/host_plugin_utils.h"
-#include "remoting/host/host_script_object.h"
+#include "remoting/host/plugin/host_plugin_utils.h"
+#include "remoting/host/plugin/host_script_object.h"
 #include "third_party/npapi/bindings/npapi.h"
 #include "third_party/npapi/bindings/npfunctions.h"
 #include "third_party/npapi/bindings/npruntime.h"
 
 // Symbol export is handled with a separate def file on Windows.
 #if defined (__GNUC__) && __GNUC__ >= 4
 #define EXPORT __attribute__((visibility("default")))
 #else
 #define EXPORT
 #endif
@@ skipping 418 matching lines @@
 }
 
 EXPORT NPError API_CALL NP_GetValue(void* npp,
                                     NPPVariable variable,
                                     void* value) {
   return GetValue((NPP)npp, variable, value);
 }
 #endif
 
 }  // extern "C"