Ensure that even if the HostResolver outlives the IO thread, its jobs will no...

chrome/browser/net/dns_global.cc

Index: chrome/browser/net/dns_global.cc
===================================================================
--- chrome/browser/net/dns_global.cc	(revision 19453)
+++ chrome/browser/net/dns_global.cc	(working copy)
@@ -444,6 +444,9 @@
     // Stop observing DNS resolutions. Note that dns_master holds a reference
     // to the global host resolver, so is guaranteed to be live.
     GetGlobalHostResolver()->RemoveObserver(&dns_resolution_observer);
+
+    // TODO(eroman): temp hack for http://crbug.com/15513
+    GetGlobalHostResolver()->Shutdown();
   }
 
   // TODO(eroman): This is a hack so the in process browser tests work if