Close the save card bubble on tab switch.

chrome/browser/ui/autofill/save_card_bubble_controller.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_UI_AUTOFILL_SAVE_CARD_BUBBLE_CONTROLLER_H_
 #define CHROME_BROWSER_UI_AUTOFILL_SAVE_CARD_BUBBLE_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 23 matching lines @@
 
   typedef std::vector<LegalMessageLine> LegalMessageLines;
 
   // Returns the title that should be displayed in the bubble.
   virtual base::string16 GetWindowTitle() const = 0;
 
   // Returns the explanatory text that should be displayed in the bubble.
   // Returns an empty string if no message should be displayed.
   virtual base::string16 GetExplanatoryMessage() const = 0;
 
+  // Hides the bubble if it is currently showing.
+  virtual void HideBubble() = 0;

[Evan Stade, 2016/01/12 00:29:00]

doesn't need to be here, SaveCardBubbleView doesn't use it and the one callsite
is a SaveCardBubbleControllerImpl instance.

[Justin Donnelly, 2016/01/12 00:40:39]

Done.

+
   // Interaction.
   virtual void OnSaveButton() = 0;
   virtual void OnCancelButton() = 0;
   virtual void OnLearnMoreClicked() = 0;
   virtual void OnLegalMessageLinkClicked(const GURL& url) = 0;
   virtual void OnBubbleClosed() = 0;
 
   // State.
 
   // Returns empty vector if no legal message should be shown.
   virtual const LegalMessageLines& GetLegalMessageLines() const = 0;
 
  protected:
   SaveCardBubbleController() {}
   virtual ~SaveCardBubbleController() {}
 
   DISALLOW_COPY_AND_ASSIGN(SaveCardBubbleController);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_AUTOFILL_SAVE_CARD_BUBBLE_CONTROLLER_H_