Add RTC_ prefix to contructormagic macros.

webrtc/modules/audio_processing/beamformer/matrix.h

 /*
  *  Copyright (c) 2014 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 342 matching lines @@
           cur_element += lhs[row][i] * rhs[i][col];
         }
 
         elements_[row][col] = cur_element;
       }
     }
 
     return *this;
   }
 
-  DISALLOW_COPY_AND_ASSIGN(Matrix);
+  RTC_DISALLOW_COPY_AND_ASSIGN(Matrix);
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_MATRIX_H_