Refactoring of new IPC-only pepper implementation

ppapi/host/dispatch_host_message.h

 // 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.
 
-#include "ipc/ipc_message_macros.h"
-
 // This file provides infrastructure for dispatching host resource call
 // messages. Normal IPC message handlers can't take extra parameters or
 // return values. We want to take a HostMessageContext as a parameter and
 // also return the int32_t return value to the caller.
 
+#ifndef PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_
+#define PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_
+
 #include "base/profiler/scoped_profile.h"  // For TRACK_RUN_IN_IPC_HANDLER.
+#include "ipc/ipc_message_macros.h"
 #include "ppapi/c/pp_errors.h"
 
 namespace ppapi {
 namespace host {
 
 struct HostMessageContext;
 
 template <class ObjT, class Method>
 inline int32_t DispatchResourceCall(ObjT* obj, Method method,
                                     HostMessageContext* context,
@@ skipping 46 matching lines @@
               &_IpcMessageHandlerClass::member_func, \
               context, p); \
         } else { \
           return PP_ERROR_FAILED; \
         }  \
       }  \
       break;
 
 }  // namespace host
 }  // namespace ppapi
+
+#endif  // PPAPI_HOST_DISPATCH_HOST_MESSAGE_H_