Revert 99666 (sync tests started failing on mac10.6:

net/base/host_resolver_proc.cc

Index: net/base/host_resolver_proc.cc
===================================================================
--- net/base/host_resolver_proc.cc	(revision 99676)
+++ net/base/host_resolver_proc.cc	(working copy)
@@ -8,7 +8,7 @@
 
 #include "base/logging.h"
 #include "net/base/address_list.h"
-#include "net/base/dns_reloader.h"
+#include "net/base/dns_reload_timer.h"
 #include "net/base/net_errors.h"
 #include "net/base/sys_addrinfo.h"
 
@@ -183,12 +183,22 @@
   // Restrict result set to only this socket type to avoid duplicates.
   hints.ai_socktype = SOCK_STREAM;
 
+  int err = getaddrinfo(host.c_str(), NULL, &hints, &ai);
+  bool should_retry = false;
 #if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD) && \
     !defined(OS_ANDROID)
-  DnsReloaderMaybeReload();
+  // If we fail, re-initialise the resolver just in case there have been any
+  // changes to /etc/resolv.conf and retry. See http://crbug.com/11380 for info.
+  if (err && DnsReloadTimerHasExpired()) {
+    // When there's no network connection, _res may not be initialized by
+    // getaddrinfo. Therefore, we call res_nclose only when there are ns
+    // entries.
+    if (_res.nscount > 0)
+      res_nclose(&_res);
+    if (!res_ninit(&_res))
+      should_retry = true;
+  }
 #endif
-  int err = getaddrinfo(host.c_str(), NULL, &hints, &ai);
-  bool should_retry = false;
   // If the lookup was restricted (either by address family, or address
   // detection), and the results where all localhost of a single family,
   // maybe we should retry.  There were several bugs related to these