Handle resubmission of HTTP Posts.

content/browser/web_contents/navigation_controller_impl.cc

Index: content/browser/web_contents/navigation_controller_impl.cc
diff --git a/content/browser/web_contents/navigation_controller_impl.cc b/content/browser/web_contents/navigation_controller_impl.cc
index 150c5dc77e312a1cc836475b4d7ea88bbed615a2..ed51e4c00e124af857784a70b8514aef3ccdc8ba 100644
--- a/content/browser/web_contents/navigation_controller_impl.cc
+++ b/content/browser/web_contents/navigation_controller_impl.cc
@@ -310,13 +310,17 @@ void NavigationControllerImpl::ReloadInternal(bool check_for_repost,
     // The user is asking to reload a page with POST data. Prompt to make sure
     // they really want to do this. If they do, the dialog will call us back
     // with check_for_repost = false.
-    content::NotificationService::current()->Notify(
-        content::NOTIFICATION_REPOST_WARNING_SHOWN,
-        content::Source<NavigationController>(this),
-        content::NotificationService::NoDetails());
-
+    if (content::NotificationService::current()) {
+      // TODO(sgurun): What is the proper way to handle this? create in
+      // contentviewcore?
+      content::NotificationService::current()->Notify(
+          content::NOTIFICATION_REPOST_WARNING_SHOWN,
+          content::Source<NavigationController>(this),
+          content::NotificationService::NoDetails());
+    }
     pending_reload_ = reload_type;
     web_contents_->Activate();
+    // TODO(sgurun): change the name to onFormResubmission http://crbug/156461
     web_contents_->GetDelegate()->ShowRepostFormWarningDialog(web_contents_);
   } else {
     DiscardNonCommittedEntriesInternal();