Avoid printing log errors during shutdown of HostResolverImpl when there are...

Avoid printing log errors during shutdown of HostResolverImpl when there are still requests outstanding.
BUG=49692
Review URL: http://codereview.chromium.org/3023011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53837 0039d316-1c4b-4281-b951-d872f2087c98

net/base/host_resolver_impl.cc

@@ -907,13 +907,14 @@ void HostResolverImpl::ProbeIPv6Support() {
 
 void HostResolverImpl::Shutdown() {
   DCHECK(CalledOnValidThread());
-  shutdown_ = true;
 
   // Cancel the outstanding jobs.
   for (JobMap::iterator it = jobs_.begin(); it != jobs_.end(); ++it)
     it->second->Cancel();
   jobs_.clear();
   DiscardIPv6ProbeJob();
+
+  shutdown_ = true;
 }
 
 void HostResolverImpl::SetPoolConstraints(JobPoolIndex pool_index,