Generate constants for HTTP status codes and reason phrases using macro.

net/http/http_status_code.cc

 // 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.
 
 #include "net/http/http_status_code.h"
 
 #include "base/logging.h"
 
 namespace net {
 
 const char* GetHttpReasonPhrase(HttpStatusCode code) {
   switch (code) {
-    case HTTP_CONTINUE:
-      return "Continue";
-    case HTTP_OK:
-      return "OK";
-    case HTTP_PARTIAL_CONTENT:
-      return "Partial Content";
-    case HTTP_FORBIDDEN:
-      return "Forbidden";
-    case HTTP_NOT_FOUND:
-      return "Not Found";
-    case HTTP_METHOD_NOT_ALLOWED:
-      return "Method Not Allowed";
-    case HTTP_REQUESTED_RANGE_NOT_SATISFIABLE:
-      return "Range Not Satisfiable";
-    case HTTP_INTERNAL_SERVER_ERROR:
-      return "Internal Server Error";
+
+#define HTTP_STATUS(label, code, reason) case HTTP_ ## label: return reason;
+#include "net/http/http_status_code_list.h"
+#undef HTTP_STATUS
+
     default:
       NOTREACHED();
   }
 
   return "";
 }
 
 }  // namespace net