Remove remains of webrtc/base

webrtc/base/safe_compare.h

Index: webrtc/base/safe_compare.h
diff --git a/webrtc/base/safe_compare.h b/webrtc/base/safe_compare.h
deleted file mode 100644
index acdd9cebd7ab1cf0d8a416e612b6fe9cb1377b2f..0000000000000000000000000000000000000000
--- a/webrtc/base/safe_compare.h
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- *  Copyright 2016 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 file defines six constexpr functions:
-//
-//   rtc::SafeEq  // ==
-//   rtc::SafeNe  // !=
-//   rtc::SafeLt  // <
-//   rtc::SafeLe  // <=
-//   rtc::SafeGt  // >
-//   rtc::SafeGe  // >=
-//
-// They each accept two arguments of arbitrary types, and in almost all cases,
-// they simply call the appropriate comparison operator. However, if both
-// arguments are integers, they don't compare them using C++'s quirky rules,
-// but instead adhere to the true mathematical definitions. It is as if the
-// arguments were first converted to infinite-range signed integers, and then
-// compared, although of course nothing expensive like that actually takes
-// place. In practice, for signed/signed and unsigned/unsigned comparisons and
-// some mixed-signed comparisons with a compile-time constant, the overhead is
-// zero; in the remaining cases, it is just a few machine instructions (no
-// branches).
-
-#ifndef WEBRTC_BASE_SAFE_COMPARE_H_
-#define WEBRTC_BASE_SAFE_COMPARE_H_
-
-
-// This header is deprecated and is just left here temporarily during
-// refactoring. See https://bugs.webrtc.org/7634 for more details.
-#include "webrtc/rtc_base/safe_compare.h"
-
-#endif  // WEBRTC_BASE_SAFE_COMPARE_H_