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

net/base/dnsrr_resolver.cc

Index: net/base/dnsrr_resolver.cc
===================================================================
--- net/base/dnsrr_resolver.cc	(revision 99676)
+++ net/base/dnsrr_resolver.cc	(working copy)
@@ -20,7 +20,7 @@
 #include "base/synchronization/lock.h"
 #include "base/task.h"
 #include "base/threading/worker_pool.h"
-#include "net/base/dns_reloader.h"
+#include "net/base/dns_reload_timer.h"
 #include "net/base/dns_util.h"
 #include "net/base/net_errors.h"
 
@@ -184,18 +184,26 @@
     }
 
     bool r = true;
-#if defined(OS_MACOSX) || defined(OS_OPENBSD)
     if ((_res.options & RES_INIT) == 0) {
       if (res_ninit(&_res) != 0)
         r = false;
     }
-#else
-    DnsReloaderMaybeReload();
-#endif
 
     if (r) {
       unsigned long saved_options = _res.options;
       r = Do();
+
+#if defined(OS_POSIX) && !defined(OS_MACOSX) && !defined(OS_OPENBSD)
+      if (!r && 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) == 0)
+          r = Do();
+      }
+#endif
       _res.options = saved_options;
     }