[net] Change order of RequestPriority to natural: higher > lower

net/base/request_priority.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.
 
 #ifndef NET_BASE_REQUEST_PRIORITY_H__
 #define NET_BASE_REQUEST_PRIORITY_H__
 #pragma once
 
 namespace net {
 
 // Prioritization used in various parts of the networking code such
 // as connection prioritization and resource loading prioritization.
 enum RequestPriority {
-  HIGHEST = 0,   // 0 must be the highest priority.
+  MINIMUM_PRIORITY = 0,
+  IDLE = 0,
+  LOWEST,
+  LOW,
   MEDIUM,
-  LOW,
-  LOWEST,
-  IDLE,
+  HIGHEST,
   NUM_PRIORITIES,
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_REQUEST_PRIORITY_H__