Revert 156678 - Native messaging now uses the MessageService back-end.

chrome/common/extensions/extension_messages.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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include "base/shared_memory.h"
 #include "base/values.h"
 #include "chrome/common/extensions/draggable_region.h"
@@ skipping 433 matching lines @@
 // the given ID.  This always returns a valid port ID which can be used for
 // sending messages.  If an error occurred, the opener will be notified
 // asynchronously.
 IPC_SYNC_MESSAGE_CONTROL4_1(ExtensionHostMsg_OpenChannelToExtension,
                             int /* routing_id */,
                             std::string /* source_extension_id */,
                             std::string /* target_extension_id */,
                             std::string /* channel_name */,
                             int /* port_id */)
 
-IPC_SYNC_MESSAGE_CONTROL5_1(ExtensionHostMsg_OpenChannelToNativeApp,
-                            int /* routing_id */,
-                            std::string /* source_extension_id */,
-                            std::string /* native_app_name */,
-                            std::string /* channel_name */,
-                            std::string /* connection_message */,
-                            int /* port_id */)
-
 // Get a port handle to the given tab.  The handle can be used for sending
 // messages to the extension.
 IPC_SYNC_MESSAGE_CONTROL4_1(ExtensionHostMsg_OpenChannelToTab,
                             int /* routing_id */,
                             int /* tab_id */,
                             std::string /* extension_id */,
                             std::string /* channel_name */,
                             int /* port_id */)
 
 // Send a message to an extension process.  The handle is the value returned
@@ skipping 86 matching lines @@
 // browser process.
 IPC_SYNC_MESSAGE_CONTROL0_1(ExtensionHostMsg_GenerateUniqueID,
                             int /* unique_id */)
 
 // Resumes resource requests for a newly created app window.
 IPC_MESSAGE_CONTROL1(ExtensionHostMsg_ResumeRequests, int /* route_id */)
 
 // Sent by the renderer when the draggable regions are updated.
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_UpdateDraggableRegions,
                     std::vector<extensions::DraggableRegion> /* regions */)