Fix leak in generated credit card bubble tests.

chrome/browser/ui/autofill/generated_credit_card_bubble_controller.cc

Index: chrome/browser/ui/autofill/generated_credit_card_bubble_controller.cc
diff --git a/chrome/browser/ui/autofill/generated_credit_card_bubble_controller.cc b/chrome/browser/ui/autofill/generated_credit_card_bubble_controller.cc
index 1c8a1701eac77a0c3e69ab224cff8802ca034516..36d8ced0ffc8f24a365967815e654ec1993bd14a 100644
--- a/chrome/browser/ui/autofill/generated_credit_card_bubble_controller.cc
+++ b/chrome/browser/ui/autofill/generated_credit_card_bubble_controller.cc
@@ -223,6 +223,8 @@ void GeneratedCreditCardBubbleController::SetupAndShow(
 }
 
 void GeneratedCreditCardBubbleController::Show(bool was_anchor_click) {
+  Hide();
+
   if (!CanShow())
     return;