[Media Router] Remove RouteIDManager.

chrome/browser/media/router/route_id_manager.h

-// Copyright 2015 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_MEDIA_ROUTER_ROUTE_ID_MANAGER_H_
-#define CHROME_BROWSER_MEDIA_ROUTER_ROUTE_ID_MANAGER_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/gtest_prod_util.h"
-#include "base/memory/singleton.h"
-#include "base/threading/non_thread_safe.h"
-
-namespace media_router {
-
-class MediaRoute;
-
-// Shared singleton which coordinates the assignment of unique IDs to
-// MediaRoute objects.
-// Class is not threadsafe; IDs should be created on the same thread.
-class RouteIDManager : public base::NonThreadSafe {
- public:
-  static RouteIDManager* GetInstance();
-
-  std::string ForLocalRoute();
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(RouteIDManagerTest, ForLocalRoute);
-  friend struct DefaultSingletonTraits<RouteIDManager>;
-
-  RouteIDManager();
-
-  // Monotonically increasing ID number.
-  uint64 next_local_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(RouteIDManager);
-};
-
-}  // namespace media_router
-
-#endif  // CHROME_BROWSER_MEDIA_ROUTER_ROUTE_ID_MANAGER_H_