Clean up dns prefetch code, and also port it.

chrome/browser/net/dns_host_info.cc

 // Copyright (c) 2006-2008 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.
 
 // See header file for description of class
 
 #include "chrome/browser/net/dns_host_info.h"
 
 #include <math.h>
 
@@ skipping 21 matching lines @@
 int DnsHostInfo::sequence_counter = 1;
 
 
 bool DnsHostInfo::NeedsDnsUpdate(const std::string& hostname) {
   DCHECK(hostname == hostname_);
   switch (state_) {
     case PENDING:  // Just now created info.
       return true;
 
     case QUEUED:  // In queue.
-    case ASSIGNED:  // Slave is working on it.
-    case ASSIGNED_BUT_MARKED:  // Slave is working on it.
+    case ASSIGNED:  // It's being resolved.
+    case ASSIGNED_BUT_MARKED:  // It's being resolved.
       return false;  // We're already working on it
 
     case NO_SUCH_NAME:  // Lookup failed.
     case FOUND:  // Lookup succeeded.
       return !IsStillCached();  // See if DNS cache expired.
 
     default:
       DCHECK(false);
       return false;
   }
@@ skipping 348 matching lines @@
     case LEARNED_REFERAL_MOTIVATED:
       return RemoveJs(referring_hostname_);
 
     default:
       return "";
   }
 }
 
 }  // namespace chrome_browser_net