[GCM] Extracting GCMConnectionObserver from GCMAppHandler

components/invalidation/gcm_invalidation_bridge.cc

Index: components/invalidation/gcm_invalidation_bridge.cc
diff --git a/components/invalidation/gcm_invalidation_bridge.cc b/components/invalidation/gcm_invalidation_bridge.cc
index 23f40afa2d236bf00260c92f8ccb6537dffab135..691be33a0e4088329e0ce8ee816d990f2bfc8e2d 100644
--- a/components/invalidation/gcm_invalidation_bridge.cc
+++ b/components/invalidation/gcm_invalidation_bridge.cc
@@ -165,8 +165,10 @@ GCMInvalidationBridge::GCMInvalidationBridge(
       weak_factory_(this) {}
 
 GCMInvalidationBridge::~GCMInvalidationBridge() {
-  if (subscribed_for_incoming_messages_)
+  if (subscribed_for_incoming_messages_) {
     gcm_driver_->RemoveAppHandler(kInvalidationsAppId);
+    gcm_driver_->RemoveConnectionObserver(this);
+  }
 }
 
 scoped_ptr<syncer::GCMNetworkChannelDelegate>
@@ -285,6 +287,7 @@ void GCMInvalidationBridge::SubscribeForIncomingMessages() {
 
   DCHECK(!subscribed_for_incoming_messages_);
   gcm_driver_->AddAppHandler(kInvalidationsAppId, this);
+  gcm_driver_->AddConnectionObserver(this);
   core_thread_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(&GCMInvalidationBridge::Core::OnConnectionStateChanged,