Move webrtc/{base => rtc_base}

webrtc/base/arraysize.h

 /*
  *  Copyright (c) 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.
  */
 
 #ifndef WEBRTC_BASE_ARRAYSIZE_H_
 #define WEBRTC_BASE_ARRAYSIZE_H_
 
-#include <stddef.h>
 
-// This file defines the arraysize() macro and is derived from Chromium's
-// base/macros.h.
-
-// The arraysize(arr) macro returns the # of elements in an array arr.
-// The expression is a compile-time constant, and therefore can be
-// used in defining new arrays, for example.  If you use arraysize on
-// a pointer by mistake, you will get a compile-time error.
-
-// This template function declaration is used in defining arraysize.
-// Note that the function doesn't need an implementation, as we only
-// use its type.
-template <typename T, size_t N> char (&ArraySizeHelper(T (&array)[N]))[N];
-
-#define arraysize(array) (sizeof(ArraySizeHelper(array)))
+// 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/arraysize.h"
 
 #endif  // WEBRTC_BASE_ARRAYSIZE_H_