Delete unused file sessionid.h.

BUG=None.

Review-Url: https://codereview.webrtc.org/2370723002
Cr-Commit-Position: refs/heads/master@{#14387}

webrtc/p2p/BUILD.gn

@@ -49,7 +49,6 @@ rtc_static_library("rtc_p2p") {
     "base/session.h",
     "base/sessiondescription.cc",
     "base/sessiondescription.h",
-    "base/sessionid.h",
     "base/stun.cc",
     "base/stun.h",
     "base/stunport.cc",

webrtc/p2p/base/sessionid.h

@@ -1,20 +0,0 @@
-/*
- *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_P2P_BASE_SESSIONID_H_
-#define WEBRTC_P2P_BASE_SESSIONID_H_
-
-// TODO: Remove this file.
-
-namespace cricket {
-
-}  // namespace cricket
-
-#endif  // WEBRTC_P2P_BASE_SESSIONID_H_

webrtc/p2p/p2p.gyp

@@ -46,7 +46,6 @@
         'base/session.h',
         'base/sessiondescription.cc',
         'base/sessiondescription.h',
-        'base/sessionid.h',
         'base/stun.cc',
         'base/stun.h',
         'base/stunport.cc',