Motown: Fix unique_ptrs to arrays so deallocation is done properly

services/media/audio/platform/linux/alsa_output.h

 // Copyright 2015 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.
 
 #ifndef SERVICES_MEDIA_AUDIO_PLATFORM_LINUX_ALSA_OUTPUT_H_
 #define SERVICES_MEDIA_AUDIO_PLATFORM_LINUX_ALSA_OUTPUT_H_
 
 #include <memory>
 
 #include "mojo/services/media/common/cpp/linear_transform.h"
@@ skipping 44 matching lines @@
   MediaResult AlsaSelectFormat(const AudioMediaTypeDetailsPtr& config);
   int AlsaWrite(const void* data, uint32_t frames);
   int AlsaGetAvailDelay(uint32_t* avail, uint32_t* delay = nullptr);
   int AlsaRecover(int err_code);
 
   void* alsa_device_ = nullptr;
   int32_t alsa_format_ = -1;
 
   LinearTransform::Ratio frames_per_tick_;
 
-  std::unique_ptr<uint8_t> mix_buf_;
+  std::unique_ptr<uint8_t[]> mix_buf_;
   uint32_t mix_buf_frames_ = 0;
 
   bool primed_ = false;
   bool local_to_output_known_ = false;
   LinearTransform local_to_output_;
   uint32_t local_to_output_gen_ = MixJob::INVALID_GENERATION + 1;
   int64_t frames_sent_;
 };
 
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo
 
 #endif  // SERVICES_MEDIA_AUDIO_PLATFORM_LINUX_ALSA_OUTPUT_H_