Refactor SyncedWindowDelegateAndroid into TabModel

chrome/browser/sync/glue/synced_window_delegate_registry.h

-// Copyright (c) 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_SYNC_GLUE_SYNCED_WINDOW_DELEGATE_REGISTRY_H_
-#define CHROME_BROWSER_SYNC_GLUE_SYNCED_WINDOW_DELEGATE_REGISTRY_H_
-#pragma once
-
-#include <set>
-
-namespace browser_sync {
-
-class SyncedWindowDelegate;
-
-// A location to register SyncedWindowDelegates such that Android can provide
-// pseudo-browsers for the purposes of Sync without having a dependency from
-// sync onto Android's model of a browser.
-class SyncedWindowDelegateRegistry {
- public:
-  static const std::set<SyncedWindowDelegate*>& GetSyncedWindowDelegates();
-  static void Register(SyncedWindowDelegate* delegate);
-  static void Unregister(SyncedWindowDelegate* delegate);
-};
-
-}  // namespace browser_sync
-
-#endif  // CHROME_BROWSER_SYNC_GLUE_SYNCED_WINDOW_DELEGATE_REGISTRY_H_