Switch to standard integer types in media/, take 2.

media/base/channel_mixer.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/channel_mixer.h"
 
+#include <stddef.h>
+
 #include "base/logging.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/audio_bus.h"
 #include "media/base/channel_mixing_matrix.h"
 #include "media/base/vector_math.h"
 
 namespace media {
 
 ChannelMixer::ChannelMixer(ChannelLayout input_layout,
                            ChannelLayout output_layout) {
@@ skipping 53 matching lines @@
       DCHECK_GE(scale, 0);
       if (scale > 0) {
         vector_math::FMAC(input->channel(input_ch), scale, output->frames(),
                           output->channel(output_ch));
       }
     }
   }
 }
 
 }  // namespace media