Move webrtc/{base => rtc_base}

webrtc/rtc_base/logging_mac.mm

 /*
  *  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.
  */
 
 #include "webrtc/base/logging.h"
 
 #import <Foundation/Foundation.h>
 
 
 namespace rtc {
 std::string DescriptionFromOSStatus(OSStatus err) {
   NSError* error =
       [NSError errorWithDomain:NSOSStatusErrorDomain code:err userInfo:nil];
   return error.description.UTF8String;
 }
 }  // namespace rtc