Simplify the magic required to create IPC message headers a bit.

chrome/common/service_messages_internal.h

 // Copyright (c) 2010 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 <string>
 
-// This header is meant to be included in multiple passes, hence no traditional
-// header guard.
-// See ipc_message_macros.h for explanation of the macros and passes.
+#include "ipc/ipc_message_macros.h"
 
-// This file needs to be included again, even though we're actually included
-// from it via utility_messages.h.
-#include "ipc/ipc_message_macros.h"
+#define IPC_MESSAGE_START ServiceMsgStart
 
 //------------------------------------------------------------------------------
 // Service process messages:
 // These are messages from the browser to the service process.
-IPC_BEGIN_MESSAGES(Service)
+// Tell the service process to enable the cloud proxy passing in the lsid
+// of the account to be used.
+IPC_MESSAGE_CONTROL1(ServiceMsg_EnableCloudPrintProxy,
+                     std::string /* lsid */)
+// Tell the service process to enable the cloud proxy passing in specific
+// tokens to be used.
+IPC_MESSAGE_CONTROL2(ServiceMsg_EnableCloudPrintProxyWithTokens,
+                     std::string, /* token for cloudprint service */
+                     std::string  /* token for Google Talk service */)
+// Tell the service process to disable the cloud proxy.
+IPC_MESSAGE_CONTROL0(ServiceMsg_DisableCloudPrintProxy)
 
-  // Tell the service process to enable the cloud proxy passing in the lsid
-  // of the account to be used.
-  IPC_MESSAGE_CONTROL1(ServiceMsg_EnableCloudPrintProxy,
-                       std::string /* lsid */)
-  // Tell the service process to enable the cloud proxy passing in specific
-  // tokens to be used.
-  IPC_MESSAGE_CONTROL2(ServiceMsg_EnableCloudPrintProxyWithTokens,
-                       std::string, /* token for cloudprint service */
-                       std::string  /* token for Google Talk service */)
-  // Tell the service process to disable the cloud proxy.
-  IPC_MESSAGE_CONTROL0(ServiceMsg_DisableCloudPrintProxy)
+// Requests a message back on whether the cloud print proxy is
+// enabled.
+IPC_MESSAGE_CONTROL0(ServiceMsg_IsCloudPrintProxyEnabled)
 
-  // Requests a message back on whether the cloud print proxy is
-  // enabled.
-  IPC_MESSAGE_CONTROL0(ServiceMsg_IsCloudPrintProxyEnabled)
+// This message is for testing purpose.
+IPC_MESSAGE_CONTROL0(ServiceMsg_Hello)
 
-  // This message is for testing purpose.
-  IPC_MESSAGE_CONTROL0(ServiceMsg_Hello)
+// This message is for enabling the remoting process.
+IPC_MESSAGE_CONTROL3(ServiceMsg_EnableRemotingWithTokens,
+                     std::string, /* username */
+                     std::string, /* Token for remoting */
+                     std::string  /* Token for Google Talk */)
 
-  // This message is for enabling the remoting process.
-  IPC_MESSAGE_CONTROL3(ServiceMsg_EnableRemotingWithTokens,
-                       std::string, /* username */
-                       std::string, /* Token for remoting */
-                       std::string  /* Token for Google Talk */)
+// Tell the service process to shutdown.
+IPC_MESSAGE_CONTROL0(ServiceMsg_Shutdown)
 
-  // Tell the service process to shutdown.
-  IPC_MESSAGE_CONTROL0(ServiceMsg_Shutdown)
-
-  // Tell the service process that an update is available.
-  IPC_MESSAGE_CONTROL0(ServiceMsg_UpdateAvailable)
-
-IPC_END_MESSAGES(Service)
+// Tell the service process that an update is available.
+IPC_MESSAGE_CONTROL0(ServiceMsg_UpdateAvailable)
 
 //------------------------------------------------------------------------------
 // Service process host messages:
 // These are messages from the service process to the browser.
-IPC_BEGIN_MESSAGES(ServiceHost)
+// Sent when the cloud print proxy has an authentication error.
+IPC_MESSAGE_CONTROL0(ServiceHostMsg_CloudPrintProxy_AuthError)
 
-  // Sent when the cloud print proxy has an authentication error.
-  IPC_MESSAGE_CONTROL0(ServiceHostMsg_CloudPrintProxy_AuthError)
+// Sent as a response to a request for enablement status.
+IPC_MESSAGE_CONTROL2(ServiceHostMsg_CloudPrintProxy_IsEnabled,
+                     bool,       /* Is the proxy enabled? */
+                     std::string /* Email address of account */)
 
-  // Sent as a response to a request for enablement status.
-  IPC_MESSAGE_CONTROL2(ServiceHostMsg_CloudPrintProxy_IsEnabled,
-                       bool,       /* Is the proxy enabled? */
-                       std::string /* Email address of account */)
-
-  // Sent from the service process in response to a Hello message.
-  IPC_MESSAGE_CONTROL0(ServiceHostMsg_GoodDay)
-
-IPC_END_MESSAGES(ServiceHost)
+// Sent from the service process in response to a Hello message.
+IPC_MESSAGE_CONTROL0(ServiceHostMsg_GoodDay)