Remove backwards compatibilty header for Optional
BUG=webrtc:8205
Review-Url: https://codereview.webrtc.org/3011963002
Cr-Commit-Position: refs/heads/master@{#19906}
diff --git a/rtc_base/optional.h b/rtc_base/optional.h
deleted file mode 100644
index 04294dc..0000000
--- a/rtc_base/optional.h
+++ /dev/null
@@ -1,19 +0,0 @@
-/*
- * Copyright 2015 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.
- */
-
-// This header is for backwards compatibility only, and will be removed soon.
-// Include webrtc/api/optional.h instead.
-
-#ifndef RTC_BASE_OPTIONAL_H_
-#define RTC_BASE_OPTIONAL_H_
-
-#include "api/optional.h"
-
-#endif // RTC_BASE_OPTIONAL_H_
