Start axing NTP4 dead code.

chrome/browser/ui/webui/ntp/recently_closed_tabs_handler.h

-// Copyright (c) 2011 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_WEBUI_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_
-#define CHROME_BROWSER_UI_WEBUI_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_
-
-#include "base/values.h"
-#include "chrome/browser/sessions/tab_restore_service.h"
-#include "chrome/browser/sessions/tab_restore_service_observer.h"
-#include "content/public/browser/web_ui_message_handler.h"
-
-class TabRestoreService;
-
-class RecentlyClosedTabsHandler : public content::WebUIMessageHandler,
-                                  public TabRestoreServiceObserver {
- public:
-  RecentlyClosedTabsHandler() : tab_restore_service_(NULL) {}
-  ~RecentlyClosedTabsHandler() override;
-
-  // WebUIMessageHandler implementation.
-  void RegisterMessages() override;
-
-  // Callback for the "reopenTab" message. Rewrites the history of the
-  // currently displayed tab to be the one in TabRestoreService with a
-  // history of a session passed in through the content pointer.
-  void HandleReopenTab(const base::ListValue* args);
-
-  // Callback for the "getRecentlyClosedTabs" message.
-  void HandleGetRecentlyClosedTabs(const base::ListValue* args);
-
-  // Callback for the "clearRecentlyClosed" message.
-  void HandleClearRecentlyClosed(const base::ListValue* args);
-
-  // Observer callback for TabRestoreServiceObserver. Sends data on
-  // recently closed tabs to the javascript side of this page to
-  // display to the user.
-  void TabRestoreServiceChanged(TabRestoreService* service) override;
-
-  // Observer callback to notice when our associated TabRestoreService
-  // is destroyed.
-  void TabRestoreServiceDestroyed(TabRestoreService* service) override;
-
- private:
-  // Construct and initialize tab_restore_service_ if it's NULL.
-  // tab_restore_service_ may still be NULL, however, in incognito mode.
-  void EnsureTabRestoreService();
-
-  // TabRestoreService that we are observing.
-  TabRestoreService* tab_restore_service_;
-
-  DISALLOW_COPY_AND_ASSIGN(RecentlyClosedTabsHandler);
-};
-
-#endif  // CHROME_BROWSER_UI_WEBUI_NTP_RECENTLY_CLOSED_TABS_HANDLER_H_