Fullscreen Notifications: Fix crash if delegate is NULL

chrome/browser/notifications/fullscreen_notification_blocker.cc

Index: chrome/browser/notifications/fullscreen_notification_blocker.cc
diff --git a/chrome/browser/notifications/fullscreen_notification_blocker.cc b/chrome/browser/notifications/fullscreen_notification_blocker.cc
index c394a5b30e09637ae08be21e041dcb7b55f87288..b555a3d2e31aec82bb9fb0e231264c7a4bcd0f98 100644
--- a/chrome/browser/notifications/fullscreen_notification_blocker.cc
+++ b/chrome/browser/notifications/fullscreen_notification_blocker.cc
@@ -71,8 +71,10 @@ void FullscreenNotificationBlocker::CheckState() {
 
 bool FullscreenNotificationBlocker::ShouldShowNotificationAsPopup(
     const message_center::Notification& notification) const {
-  bool enabled = !is_fullscreen_mode_ ||
-      notification.delegate()->ShouldDisplayOverFullscreen();
+  bool enabled = !is_fullscreen_mode_;
+  if (is_fullscreen_mode_ && notification.delegate())
+    enabled = notification.delegate()->ShouldDisplayOverFullscreen();
+
 #if defined(USE_ASH)
   if (ash::Shell::HasInstance())
     enabled = enabled || ash::system_notifier::ShouldAlwaysShowPopups(