[rAC, OSX] Use bubble windows for error messages.

chrome/browser/ui/cocoa/autofill/autofill_details_container.h

Index: chrome/browser/ui/cocoa/autofill/autofill_details_container.h
diff --git a/chrome/browser/ui/cocoa/autofill/autofill_details_container.h b/chrome/browser/ui/cocoa/autofill/autofill_details_container.h
index 2cd82cdf59092a31bede7d80aa49e9054c5618fe..4000f0a839fbd8d4c8208f8600e18c26070646c2 100644
--- a/chrome/browser/ui/cocoa/autofill/autofill_details_container.h
+++ b/chrome/browser/ui/cocoa/autofill/autofill_details_container.h
@@ -18,6 +18,7 @@ class AutofillDialogViewDelegate;
 }
 
 @class InfoBubbleView;
+@class AutofillErrorBubbleController;
 
 // UI controller for details for current payment instrument.
 @interface AutofillDetailsContainer
@@ -33,6 +34,8 @@ class AutofillDialogViewDelegate;
   // An info bubble to display validation errors.
   base::scoped_nsobject<InfoBubbleView> errorBubble_;
 
+  AutofillErrorBubbleController* errorBubbleController_;
+
   autofill::AutofillDialogViewDelegate* delegate_;  // Not owned.
 }