Add RTC_ prefix to contructormagic macros.

webrtc/sound/alsasoundsystem.h

 /*
  *  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.
  */
 
@@ skipping 77 matching lines @@
       size_t frame_size,
       int wait_timeout_ms,
       int flags,
       int freq);
 
   const char *GetError(int err);
 
   bool initialized_;
   AlsaSymbolTable symbol_table_;
 
-  DISALLOW_COPY_AND_ASSIGN(AlsaSoundSystem);
+  RTC_DISALLOW_COPY_AND_ASSIGN(AlsaSoundSystem);
 };
 
 }  // namespace rtc
 
 #endif  // WEBRTC_SOUND_ALSASOUNDSYSTEM_H_