Plumb through NetworkChangeNotifier::IsOffline() to WebKit, enabling

net/base/host_resolver_impl.cc

 // Copyright (c) 2010 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.
 
 #include "net/base/host_resolver_impl.h"
 
 #if defined(OS_WIN)
 #include <Winsock2.h>
 #elif defined(OS_POSIX)
 #include <netdb.h>
@@ skipping 905 matching lines @@
   // so we choose some defaults, which users can override later.
   job_pools_[POOL_NORMAL] = new JobPool(max_jobs, 100u * max_jobs);
 
 #if defined(OS_WIN)
   EnsureWinsockInit();
 #endif
 #if defined(OS_LINUX)
   if (HaveOnlyLoopbackAddresses())
     additional_resolver_flags_ |= HOST_RESOLVER_LOOPBACK_ONLY;
 #endif
-  NetworkChangeNotifier::AddObserver(this);
+  NetworkChangeNotifier::AddIPAddressObserver(this);
 }
 
 HostResolverImpl::~HostResolverImpl() {
   // Cancel the outstanding jobs. Those jobs may contain several attached
   // requests, which will also be cancelled.
   DiscardIPv6ProbeJob();
 
   CancelAllJobs();
 
   // In case we are being deleted during the processing of a callback.
   if (cur_completing_job_)
     cur_completing_job_->Cancel();
 
-  NetworkChangeNotifier::RemoveObserver(this);
+  NetworkChangeNotifier::RemoveIPAddressObserver(this);
 
   // Delete the job pools.
   for (size_t i = 0u; i < arraysize(job_pools_); ++i)
     delete job_pools_[i];
 }
 
 void HostResolverImpl::ProbeIPv6Support() {
   DCHECK(CalledOnValidThread());
   DCHECK(!ipv6_probe_monitoring_);
   ipv6_probe_monitoring_ = true;
@@ skipping 501 matching lines @@
     additional_resolver_flags_ |= HOST_RESOLVER_LOOPBACK_ONLY;
   } else {
     additional_resolver_flags_ &= ~HOST_RESOLVER_LOOPBACK_ONLY;
   }
 #endif
   AbortAllInProgressJobs();
   // |this| may be deleted inside AbortAllInProgressJobs().
 }
 
 }  // namespace net