Zero initialize OPUS stream mapping data.

media/filters/opus_audio_decoder.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/filters/opus_audio_decoder.h"
 
 #include <cmath>
 
 #include "base/single_thread_task_runner.h"
 #include "base/sys_byteorder.h"
@@ skipping 155 matching lines @@
 static const int kOpusExtraDataStreamMapOffset =
     kOpusExtraDataNumStreamsOffset + 2;
 
 struct OpusExtraData {
   OpusExtraData()
       : channels(0),
         skip_samples(0),
         channel_mapping(0),
         num_streams(0),
         num_coupled(0),
-        gain_db(0) {
+        gain_db(0),
+        stream_map() {
     memcpy(stream_map,
            kDefaultOpusChannelLayout,
            kMaxChannelsWithDefaultLayout);
   }
   int channels;
   uint16 skip_samples;
   int channel_mapping;
   int num_streams;
   int num_coupled;
   int16 gain_db;
@@ skipping 290 matching lines @@
     output_buffer->get()->TrimEnd(trim_frames);
 
   // Handles discards and timestamping.  Discard the buffer if more data needed.
   if (!discard_helper_->ProcessBuffers(input, *output_buffer))
     *output_buffer = NULL;
 
   return true;
 }
 
 }  // namespace media