Fix leak in generated credit card bubble tests.

chrome/browser/ui/autofill/generated_credit_card_bubble_controller.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/autofill/generated_credit_card_bubble_controller.h"
 
 #include <climits>
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
@@ skipping 205 matching lines @@
   end_link.is_link = true;
   contents_text_ranges_.push_back(end_link);
 
   UpdateAnchor();
 
   if (ShouldDisplayBubbleInitially())
     Show(false);
 }
 
 void GeneratedCreditCardBubbleController::Show(bool was_anchor_click) {
+  Hide();
+
   if (!CanShow())
     return;
 
   bubble_ = CreateBubble();
   if (!bubble_) {
     // TODO(dbeam): Make a bubble on all applicable platforms.
     return;
   }
 
   bubble_->Show();
@@ skipping 13 matching lines @@
   if (browser && browser->window() && browser->window()->GetLocationBar())
     browser->window()->GetLocationBar()->UpdateGeneratedCreditCardView();
 }
 
 void GeneratedCreditCardBubbleController::Hide() {
   if (bubble_ && !bubble_->IsHiding())
     bubble_->Hide();
 }
 
 }  // namespace autofill