Use validating IPC enum macros in websocket messages

content/common/websocket.h

 // Copyright 2013 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 CONTENT_COMMON_WEBSOCKET_H_
 #define CONTENT_COMMON_WEBSOCKET_H_
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/time/time.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // WebSocket data message types sent between the browser and renderer processes.
 enum WebSocketMessageType {
   WEB_SOCKET_MESSAGE_TYPE_CONTINUATION = 0x0,
   WEB_SOCKET_MESSAGE_TYPE_TEXT = 0x1,
-  WEB_SOCKET_MESSAGE_TYPE_BINARY = 0x2
+  WEB_SOCKET_MESSAGE_TYPE_BINARY = 0x2,
+  WEB_SOCKET_MESSAGE_TYPE_LAST = WEB_SOCKET_MESSAGE_TYPE_BINARY
 };
 
 // Opening handshake request information which will be shown in the inspector.
 // All string data should be encoded to ASCII in the browser process.
 struct WebSocketHandshakeRequest {
   WebSocketHandshakeRequest();
   ~WebSocketHandshakeRequest();
 
   // The request URL
   GURL url;
@@ skipping 17 matching lines @@
   std::string status_text;
   // Additional HTTP response headers
   std::vector<std::pair<std::string, std::string> > headers;
   // The time that this response arrives
   base::Time response_time;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_WEBSOCKET_H_