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

net/base/host_resolver_impl.h

Index: net/base/host_resolver_impl.h
diff --git a/net/base/host_resolver_impl.h b/net/base/host_resolver_impl.h
index a571bb717ab5f76998a5cb951a21cad759cde8e7..89d4f46e0303bc65e456276ec197ea5b7b7c5390 100644
--- a/net/base/host_resolver_impl.h
+++ b/net/base/host_resolver_impl.h
@@ -51,7 +51,7 @@ namespace net {
 
 class HostResolverImpl : public HostResolver,
                          public base::NonThreadSafe,
-                         public NetworkChangeNotifier::Observer {
+                         public NetworkChangeNotifier::IPAddressObserver {
  public:
   // The index into |job_pools_| for the various job pools. Pools with a higher
   // index have lower priority.
@@ -223,7 +223,7 @@ class HostResolverImpl : public HostResolver,
   // Aborts all in progress jobs (but might start new ones).
   void AbortAllInProgressJobs();
 
-  // NetworkChangeNotifier::Observer methods:
+  // NetworkChangeNotifier::IPAddressObserver methods:
   virtual void OnIPAddressChanged();
 
   // Cache of host resolution results.