Componentize sad_tab

chrome/browser/ui/sad_tab.h

-// Copyright 2012 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_SAD_TAB_H_
-#define CHROME_BROWSER_UI_SAD_TAB_H_
-
-#include "base/process/kill.h"
-#include "chrome/browser/ui/sad_tab_types.h"
-
-namespace content {
-class WebContents;
-}
-
-namespace chrome {
-
-// Cross-platform interface to show the Sad tab UI.
-class SadTab {
- public:
-  // Factory function to create the platform specific implementations.
-  static SadTab* Create(content::WebContents* web_contents, SadTabKind kind);
-
-  // Returns true if the sad tab should be shown.
-  static bool ShouldShow(base::TerminationStatus status);
-
-  virtual ~SadTab() {}
-
-  // Shows the Sad tab.
-  virtual void Show() = 0;
-
-  // Closes the Sad tab.
-  virtual void Close() = 0;
-};
-
-}  // namespace chrome
-
-#endif  // CHROME_BROWSER_UI_SAD_TAB_H_