Always Close the Autofill UI through the same path

chrome/browser/autofill/autofill_external_delegate.h

Index: chrome/browser/autofill/autofill_external_delegate.h
diff --git a/chrome/browser/autofill/autofill_external_delegate.h b/chrome/browser/autofill/autofill_external_delegate.h
index 70ee882d4df9a6d163109cb6e47eafcc2c2abfff..562a8b42e6caa6088dba21c92035a5ada2b14761 100644
--- a/chrome/browser/autofill/autofill_external_delegate.h
+++ b/chrome/browser/autofill/autofill_external_delegate.h
@@ -127,6 +127,11 @@ class AutofillExternalDelegate
 
   AutofillPopupControllerImpl* controller() { return controller_; }
 
+  // For testing purposes only.
+  void set_controller(base::WeakPtr<AutofillPopupControllerImpl> controller) {
+    controller_ = controller;
+  }
+
  private:
   // Fills the form with the Autofill data corresponding to |unique_id|.
   // If |is_preview| is true then this is just a preview to show the user what