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

net/spdy/spdy_session_pool.h

Index: net/spdy/spdy_session_pool.h
diff --git a/net/spdy/spdy_session_pool.h b/net/spdy/spdy_session_pool.h
index 10da7475576aee087170a05826935b910b965b9e..a99268e6b73ff4e1bff887111ab75b6300cd39cb 100644
--- a/net/spdy/spdy_session_pool.h
+++ b/net/spdy/spdy_session_pool.h
@@ -35,7 +35,7 @@ class SpdySession;
 // This is a very simple pool for open SpdySessions.
 // TODO(mbelshe): Make this production ready.
 class SpdySessionPool
-    : public NetworkChangeNotifier::Observer,
+    : public NetworkChangeNotifier::IPAddressObserver,
       public SSLConfigService::Observer {
  public:
   explicit SpdySessionPool(SSLConfigService* ssl_config_service);
@@ -93,7 +93,7 @@ class SpdySessionPool
   SpdySettingsStorage* mutable_spdy_settings() { return &spdy_settings_; }
   const SpdySettingsStorage& spdy_settings() const { return spdy_settings_; }
 
-  // NetworkChangeNotifier::Observer methods:
+  // NetworkChangeNotifier::IPAddressObserver methods:
 
   // We flush all idle sessions and release references to the active ones so
   // they won't get re-used.  The active ones will either complete successfully