Tracks all open input streams in AudioManagerBase.

media/audio/mac/audio_manager_mac.cc

Index: media/audio/mac/audio_manager_mac.cc
diff --git a/media/audio/mac/audio_manager_mac.cc b/media/audio/mac/audio_manager_mac.cc
index f59e9d4da4bfa90d9696b0a9b882a6d06a3952b1..14877a95f92eb8321907344a80187c9c9ae63a5f 100644
--- a/media/audio/mac/audio_manager_mac.cc
+++ b/media/audio/mac/audio_manager_mac.cc
@@ -384,34 +384,6 @@ AudioManagerMac::~AudioManagerMac() {
   // and IncreaseIOBufferSizeIfPossible() which both touches native Core Audio
   // APIs and they can fail and disrupt tests during shutdown.
   in_shutdown_ = true;
-  // We have seen cases where active input audio is not closed down properly
-  // at browser shutdown. AudioInputController::Close() is called but tasks
-  // in AudioInputController::DoClose() are not executed. Hence, input streams
-  // might remain even at this late state. |low_latency_input_streams_| will be
-  // modified during the call to stream->Close(), so we can't iterate over it
-  // here.  Instead iterate over a copy.
-  // TODO(henrika): figure out the real cause why streams are not closed
-  // properly by the AIC for all cases and then remove this loop.
-  auto low_latency_input_streams_copy = low_latency_input_streams_;
-  for (auto* stream : low_latency_input_streams_copy) {
-    LOG(WARNING) << "Closing existing audio input stream at destruction";
-    // Prevents active Core Audio callbacks to use possibly invalid objects
-    // in its OnData() callback.
-    stream->Stop();
-    // Avoids hitting CHECK in dtor of AudioManagerBase.
-    stream->Close();
-  }
-  // Perform same type of cleanup as above but for high-latency input streams.
-  auto basic_input_streams_copy = basic_input_streams_;
-  for (auto* stream : basic_input_streams_copy) {
-    LOG(WARNING)
-        << "Closing existing high-latency audio input stream at destruction";
-    // Prevents active AudioQueue callbacks to use possibly invalid objects
-    // in its OnData() callback.
-    stream->Stop();
-    // Avoids hitting CHECK in dtor of AudioManagerBase.
-    stream->Close();
-  }
   Shutdown();
 }