Move SessionStorageNamespace entirely into NavigationController and support StoragePartitions.

chrome/browser/notifications/balloon_host.cc

Index: chrome/browser/notifications/balloon_host.cc
diff --git a/chrome/browser/notifications/balloon_host.cc b/chrome/browser/notifications/balloon_host.cc
index b3baa9b0ac7f1cc40a1d76d1fc47ec0dd15e8cb5..b858125a668e1be3d6214a7324dc8d611276ad1f 100644
--- a/chrome/browser/notifications/balloon_host.cc
+++ b/chrome/browser/notifications/balloon_host.cc
@@ -133,7 +133,6 @@ void BalloonHost::Init() {
       balloon_->profile(),
       site_instance_.get(),
       MSG_ROUTING_NONE,
-      NULL,
       NULL));
   chrome::SetViewType(web_contents_.get(), chrome::VIEW_TYPE_NOTIFICATION);
   web_contents_->SetDelegate(this);