Modify extension request IPC messages to pass a ListValue instead of a string.

chrome/common/render_messages_internal.h

 // Copyright (c) 2009 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.
 
 // 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 <map>
 #include <string>
@@ skipping 1589 matching lines @@
   // TODO(hclam): change this to vector if we have channel numbers other than 2.
   IPC_MESSAGE_ROUTED3(ViewHostMsg_SetAudioVolume,
                       int /* stream_id */,
                       double /* left_channel */,
                       double /* right_channel */)
 
   // A renderer sends this message when an extension process starts an API
   // request. The browser will always respond with a ViewMsg_ExtensionResponse.
   IPC_MESSAGE_ROUTED4(ViewHostMsg_ExtensionRequest,
                       std::string /* name */,
-                      std::string /* argument */,
+                      ListValue /* argument */,
                       int /* callback id */,
                       bool /* has_callback */)
 
   // Notify the browser that this renderer added a listener to an event.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_ExtensionAddListener,
                        std::string /* name */)
 
   // Notify the browser that this renderer removed a listener from an event.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_ExtensionRemoveListener,
                        std::string /* name */)
@@ skipping 213 matching lines @@
   IPC_MESSAGE_CONTROL2(ViewHostMsg_DatabaseGetFileAttributes,
                        FilePath /* the name of the file */,
                        int32 /* a unique message ID */)
 
   // Asks the browser process to return the size of a DB file
   IPC_MESSAGE_CONTROL2(ViewHostMsg_DatabaseGetFileSize,
                        FilePath /* the name of the file */,
                        int32 /* a unique message ID */)
 
 IPC_END_MESSAGES(ViewHost)