Logs different SaveCardPrompt histogram names depending on if user

chrome/browser/ui/autofill/save_card_bubble_controller_impl.h

Index: chrome/browser/ui/autofill/save_card_bubble_controller_impl.h
diff --git a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.h b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.h
index 1f5382fe080b36fd8ff43eaefdae8615d911e65b..2b924ab87d7a7a865ff9ab81c503911c09bf5fc0 100644
--- a/chrome/browser/ui/autofill/save_card_bubble_controller_impl.h
+++ b/chrome/browser/ui/autofill/save_card_bubble_controller_impl.h
@@ -14,6 +14,8 @@
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 
+class PrefService;
+
 namespace autofill {
 
 // Implementation of per-tab class to control the save credit card bubble and
@@ -93,6 +95,9 @@ class SaveCardBubbleControllerImpl
   // Weak reference. Will be nullptr if no bubble is currently shown.
   SaveCardBubbleView* save_card_bubble_view_;
 
+  // Weak reference to read & write |kAutofillAcceptSaveCreditCardPromptState|.
+  PrefService* pref_service_;
+
   // Callback to run if user presses Save button in the bubble.
   // If save_card_callback_.is_null() is true then no bubble is available to
   // show and the icon is not visible.