Don't update the save card bubble icon once the browser isn't available.

chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc

Index: chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
diff --git a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
index b963de56055ea56191965c39a351f6e6672782af..4ce53664ac118eb18957f821fcf8aca4cbcba998 100644
--- a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
+++ b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.cc
@@ -299,6 +299,8 @@ void SaveCardBubbleControllerImpl::ShowBubble() {
 
 void SaveCardBubbleControllerImpl::UpdateIcon() {
   Browser* browser = chrome::FindBrowserWithWebContents(web_contents());
+  if (!browser)
+    return;
   LocationBar* location_bar = browser->window()->GetLocationBar();
   location_bar->UpdateSaveCreditCardIcon();
 }