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

ipc/ipc_message_utils.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.
 
 #ifndef IPC_IPC_MESSAGE_UTILS_H_
 #define IPC_IPC_MESSAGE_UTILS_H_
 #pragma once
 
 #include <algorithm>
 #include <string>
@@ skipping 32 matching lines @@
 #endif
 
 // Used by IPC_BEGIN_MESSAGES so that each message class starts from a unique
 // base.  Messages have unique IDs across channels in order for the IPC logging
 // code to figure out the message class from its ID.
 enum IPCMessageStart {
   // By using a start value of 0 for automation messages, we keep backward
   // compatibility with old builds.
   AutomationMsgStart = 0,
   ViewMsgStart,
-  ViewHostMsgStart,
-  PluginProcessMsgStart,
-  PluginProcessHostMsgStart,
   PluginMsgStart,
-  PluginHostMsgStart,
-  ProfileImportProcessMsgStart,
-  ProfileImportProcessHostMsgStart,
-  NPObjectMsgStart,
+  ProfileImportMsgStart,
   TestMsgStart,
-  DevToolsAgentMsgStart,
-  DevToolsClientMsgStart,
-  WorkerProcessMsgStart,
-  WorkerProcessHostMsgStart,
+  DevToolsMsgStart,
   WorkerMsgStart,
-  WorkerHostMsgStart,
-  NaClProcessMsgStart,
-  GpuCommandBufferMsgStart,
+  NaClMsgStart,
   UtilityMsgStart,
-  UtilityHostMsgStart,
   GpuMsgStart,
-  GpuHostMsgStart,
-  GpuChannelMsgStart,
-  GpuVideoDecoderHostMsgStart,
-  GpuVideoDecoderMsgStart,
   ServiceMsgStart,
-  ServiceHostMsgStart,
   PpapiMsgStart,
-  PpapiHostMsgStart,
-  // NOTE: When you add a new message class, also update
-  // IPCStatusView::IPCStatusView to ensure logging works.
-  LastMsgIndex
+  FirefoxImporterUnittestMsgStart,
 };
 
 class DictionaryValue;
 class FilePath;
 class ListValue;
 class NullableString16;
 
 namespace base {
 class Time;
 class TimeDelta;
@@ skipping 1105 matching lines @@
     ReplyParam p(a, b, c, d, e);
     WriteParam(reply, p);
   }
 };
 
 //-----------------------------------------------------------------------------
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_MESSAGE_UTILS_H_