[Sync] Move sessions files from sync_driver to sync_sessions.

components/sync_driver/sessions/synced_window_delegates_getter.h

-// Copyright 2014 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 COMPONENTS_SYNC_DRIVER_SESSIONS_SYNCED_WINDOW_DELEGATES_GETTER_H_
-#define COMPONENTS_SYNC_DRIVER_SESSIONS_SYNCED_WINDOW_DELEGATES_GETTER_H_
-
-#include <set>
-
-#include "base/macros.h"
-#include "components/sessions/core/session_id.h"
-
-namespace browser_sync {
-
-class SyncedWindowDelegate;
-
-// An interface for accessing SyncedWindowDelegates. Subclasses define
-// how this is done on different platforms.
-class SyncedWindowDelegatesGetter {
- public:
-  SyncedWindowDelegatesGetter();
-  virtual ~SyncedWindowDelegatesGetter();
-
-  // Returns all SyncedWindowDelegate instances.
-  virtual std::set<const SyncedWindowDelegate*> GetSyncedWindowDelegates() = 0;
-
-  // Find a SyncedWindowDelegate given its window's id.
-  virtual const SyncedWindowDelegate* FindById(SessionID::id_type id) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SyncedWindowDelegatesGetter);
-};
-
-}  // namespace browser_sync
-
-#endif  // COMPONENTS_SYNC_DRIVER_SESSIONS_SYNCED_WINDOW_DELEGATES_GETTER_H_