Makes AudioOutputDispatcher non-ref-counted.

media/audio/audio_output_resampler.cc

Index: media/audio/audio_output_resampler.cc
diff --git a/media/audio/audio_output_resampler.cc b/media/audio/audio_output_resampler.cc
index e81af4a6a40d9f63d1da04c8bf1089319b67ea7d..33a4ccd960e1c157f5bea0a3cfd1eae60fafbb7a 100644
--- a/media/audio/audio_output_resampler.cc
+++ b/media/audio/audio_output_resampler.cc
@@ -13,6 +13,7 @@
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/numerics/safe_conversions.h"
@@ -255,7 +256,6 @@ void AudioOutputResampler::Reinitialize() {
   // Log a trace event so we can get feedback in the field when this happens.
   TRACE_EVENT0("audio", "AudioOutputResampler::Reinitialize");
 
-  dispatcher_->Shutdown();
   output_params_ = original_output_params_;
   streams_opened_ = false;
   Initialize();
@@ -264,7 +264,7 @@ void AudioOutputResampler::Reinitialize() {
 void AudioOutputResampler::Initialize() {
   DCHECK(!streams_opened_);
   DCHECK(callbacks_.empty());
-  dispatcher_ = new AudioOutputDispatcherImpl(
+  dispatcher_ = base::MakeUnique<AudioOutputDispatcherImpl>(
       audio_manager_, output_params_, device_id_, close_delay_);
 }
 
@@ -391,17 +391,6 @@ void AudioOutputResampler::CloseStream(AudioOutputProxy* stream_proxy) {
   }
 }
 
-void AudioOutputResampler::Shutdown() {
-  DCHECK(task_runner_->BelongsToCurrentThread());
-
-  // No AudioOutputProxy objects should hold a reference to us when we get
-  // to this stage.
-  DCHECK(HasOneRef()) << "Only the AudioManager should hold a reference";
-
-  dispatcher_->Shutdown();
-  DCHECK(callbacks_.empty());
-}
-
 OnMoreDataConverter::OnMoreDataConverter(const AudioParameters& input_params,
                                          const AudioParameters& output_params)
     : io_ratio_(static_cast<double>(input_params.GetBytesPerSecond()) /