Use validating IPC enum macros in websocket messages

content/common/websocket_messages.h

Index: content/common/websocket_messages.h
diff --git a/content/common/websocket_messages.h b/content/common/websocket_messages.h
index dadece4706dbc8606a5f6e35538c60905e7193ef..0781562e755e2612899adfc79c243c3fbdfcee47 100644
--- a/content/common/websocket_messages.h
+++ b/content/common/websocket_messages.h
@@ -26,6 +26,9 @@
 #define IPC_MESSAGE_EXPORT CONTENT_EXPORT
 #define IPC_MESSAGE_START WebSocketMsgStart
 
+IPC_ENUM_TRAITS_MAX_VALUE(content::WebSocketMessageType,
+                          content::WEB_SOCKET_MESSAGE_TYPE_LAST)
+
 IPC_STRUCT_TRAITS_BEGIN(content::WebSocketHandshakeRequest)
   IPC_STRUCT_TRAITS_MEMBER(url)
   IPC_STRUCT_TRAITS_MEMBER(headers)
@@ -101,8 +104,6 @@ IPC_MESSAGE_ROUTED1(WebSocketMsg_NotifyFailure,
 
 // WebSocket messages that can be sent in either direction.
 
-IPC_ENUM_TRAITS(content::WebSocketMessageType)
-
 // Send a non-control frame on |channel_id|. If the sender is the renderer, it
 // will be sent to the remote server. If the sender is the browser, it comes
 // from the remote server. |fin| indicates that this frame is the last in the