Use validating param traits for MediaStreamType enum

content/common/media/media_stream_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 the media streaming.
 // Multiply-included message file, hence no include guard.
 
 #include <string>
 
 #include "content/common/content_export.h"
 #include "content/common/media/media_stream_options.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_macros.h"
 
 #undef IPC_MESSAGE_EXPORT
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 #define IPC_MESSAGE_START MediaStreamMsgStart
 
-IPC_ENUM_TRAITS(content::MediaStreamType)
+IPC_ENUM_TRAITS_MAX_VALUE(content::MediaStreamType,
+                          content::NUM_MEDIA_TYPES - 1)
 
 IPC_STRUCT_TRAITS_BEGIN(content::StreamOptions)
   IPC_STRUCT_TRAITS_MEMBER(audio_type)
   IPC_STRUCT_TRAITS_MEMBER(audio_device_id)
   IPC_STRUCT_TRAITS_MEMBER(video_type)
   IPC_STRUCT_TRAITS_MEMBER(video_device_id)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(content::StreamDeviceInfo)
   IPC_STRUCT_TRAITS_MEMBER(device.type)
@@ skipping 66 matching lines @@
                      content::MediaStreamType /* type */,
                      GURL /* security origin */)
 
 // Request to open the device.
 IPC_MESSAGE_CONTROL5(MediaStreamHostMsg_OpenDevice,
                      int /* render view id */,
                      int /* request id */,
                      std::string /* device_id */,
                      content::MediaStreamType /* type */,
                      GURL /* security origin */)