[chromecast] Deletes dead code to track MediaPipelineBackend.

chromecast/media/cma/pipeline/media_pipeline_impl.cc

 // Copyright 2014 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 "chromecast/media/cma/pipeline/media_pipeline_impl.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 85 matching lines @@
       weak_factory_(this) {
   CMALOG(kLogControl) << __FUNCTION__;
   weak_this_ = weak_factory_.GetWeakPtr();
   thread_checker_.DetachFromThread();
 }
 
 MediaPipelineImpl::~MediaPipelineImpl() {
   CMALOG(kLogControl) << __FUNCTION__;
   DCHECK(thread_checker_.CalledOnValidThread());
 
-  weak_factory_.InvalidateWeakPtrs();
-
   if (backend_state_ != BACKEND_STATE_UNINITIALIZED &&
       backend_state_ != BACKEND_STATE_INITIALIZED)
     metrics::CastMetricsHelper::GetInstance()->RecordApplicationEvent(
         "Cast.Platform.Ended");
-
-  // Since av pipeline still need to access device components in their
-  // destructor, it's important to delete them first.
-  video_pipeline_.reset();
-  audio_pipeline_.reset();
-  audio_decoder_.reset();
-  media_pipeline_backend_.reset();
-  if (!client_.pipeline_backend_destroyed_cb.is_null())
-    client_.pipeline_backend_destroyed_cb.Run();
 }
 
 void MediaPipelineImpl::Initialize(
     LoadType load_type,
     std::unique_ptr<MediaPipelineBackend> media_pipeline_backend) {
   CMALOG(kLogControl) << __FUNCTION__;
   DCHECK(thread_checker_.CalledOnValidThread());
   audio_decoder_.reset();
-  media_pipeline_backend_.reset(media_pipeline_backend.release());
-  if (!client_.pipeline_backend_created_cb.is_null())
-    client_.pipeline_backend_created_cb.Run();
+  media_pipeline_backend_ = std::move(media_pipeline_backend);
 
   if (load_type == kLoadTypeURL || load_type == kLoadTypeMediaSource) {
     base::TimeDelta low_threshold(kLowBufferThresholdURL);
     base::TimeDelta high_threshold(kHighBufferThresholdURL);
     if (load_type == kLoadTypeMediaSource) {
       low_threshold = kLowBufferThresholdMediaSource;
       high_threshold = kHighBufferThresholdMediaSource;
     }
     scoped_refptr<BufferingConfig> buffering_config(
         new BufferingConfig(low_threshold, high_threshold));
@@ skipping 429 matching lines @@
 
 void MediaPipelineImpl::ResetBitrateState() {
   elapsed_time_delta_ = base::TimeDelta::FromSeconds(0);
   audio_bytes_for_bitrate_estimation_ = 0;
   video_bytes_for_bitrate_estimation_ = 0;
   last_sample_time_ = base::TimeTicks::Now();
 }
 
 }  // namespace media
 }  // namespace chromecast