Revert of [Presentation API / Media Router] Clean up default pres URL logic.

chrome/browser/media/router/render_frame_host_id.h

Index: chrome/browser/media/router/render_frame_host_id.h
diff --git a/chrome/browser/media/router/render_frame_host_id.h b/chrome/browser/media/router/render_frame_host_id.h
deleted file mode 100644
index d9fb005a8bbebd922827b6399aea2e74a440633d..0000000000000000000000000000000000000000
--- a/chrome/browser/media/router/render_frame_host_id.h
+++ /dev/null
@@ -1,16 +0,0 @@
-// 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_RENDER_FRAME_HOST_ID_H_
-#define CHROME_BROWSER_MEDIA_ROUTER_RENDER_FRAME_HOST_ID_H_
-
-#include <utility>
-
-namespace media_router {
-
-using RenderFrameHostId = std::pair<int, int>;
-
-}  // namespace media_router
-
-#endif  // CHROME_BROWSER_MEDIA_ROUTER_RENDER_FRAME_HOST_ID_H_