Convert ValidationMessageBubbleView to BubbleDialogDelegate

chrome/browser/ui/validation_message_bubble.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_UI_VALIDATION_MESSAGE_BUBBLE_H_
 #define CHROME_BROWSER_UI_VALIDATION_MESSAGE_BUBBLE_H_
 
 #include <memory>
 
 #include "base/strings/string16.h"
 
 namespace content {
 class RenderWidgetHost;
 }
 
 namespace gfx {
 class Rect;
 }
 
 class ValidationMessageBubble {
  public:
   // Open a tooltip-like window to show the specified messages.  The window
   // should not change focus state.
-  static std::unique_ptr<ValidationMessageBubble> CreateAndShow(
+  static base::WeakPtr<ValidationMessageBubble> CreateAndShow(
       content::RenderWidgetHost* widget_host,
       const gfx::Rect& anchor_in_root_view,
       const base::string16& main_text,
       const base::string16& sub_text);
 
-  // Close the window and destruct the object.
-  virtual ~ValidationMessageBubble() {}
-
   // Move the window to a position such that the bubble arrow points to the
   // specified anchor.  |anchor_in_root_view| is in DIP unit, and relative to
   // RWHV for |widget_host|.
   virtual void SetPositionRelativeToAnchor(
       content::RenderWidgetHost* widget_host,
       const gfx::Rect& anchor_in_root_view) = 0;
+
+  // Called to close the bubble. This should lead to destruction of |this|.
+  virtual void CloseValidationMessage() = 0;
+
+ protected:
+  virtual ~ValidationMessageBubble() {}
 };
 
 #endif  // CHROME_BROWSER_UI_VALIDATION_MESSAGE_BUBBLE_H_