Revert 99677 (didn't help) - Revert 99666 (sync tests started failing on mac10.6:

net/base/dns_reload_timer.h

Index: net/base/dns_reload_timer.h
===================================================================
--- net/base/dns_reload_timer.h	(revision 99692)
+++ net/base/dns_reload_timer.h	(working copy)
@@ -1,22 +0,0 @@
-// 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_DNS_RELOAD_TIMER_H_
-#define NET_BASE_DNS_RELOAD_TIMER_H_
-#pragma once
-
-#include "build/build_config.h"
-
-#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD)
-namespace net {
-
-// DnsReloadTimerExpired tests the thread local DNS reload timer and, if it has
-// expired, returns true and resets the timer. See comments in
-// host_resolver_proc.cc for details.
-bool DnsReloadTimerHasExpired();
-
-}  // namespace net
-#endif
-
-#endif  // NET_BASE_DNS_RELOAD_TIMER_H_