Ensures that audio tasks cannot run after AudioManager is deleted.

media/audio/audio_manager_base.cc

Index: media/audio/audio_manager_base.cc
diff --git a/media/audio/audio_manager_base.cc b/media/audio/audio_manager_base.cc
index 456adf7cc8908299640004114f29d60f351ff1ba..c3579e68abb289377b27148d5338f4b090105847 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -98,8 +98,6 @@ AudioManagerBase::AudioManagerBase(
       audio_log_factory_(audio_log_factory) {}
 
 AudioManagerBase::~AudioManagerBase() {
-  DCHECK(GetTaskRunner()->BelongsToCurrentThread());
-
   // All the output streams should have been deleted.
   CHECK_EQ(0, num_output_streams_);
   // All the input streams should have been deleted.
@@ -360,7 +358,6 @@ void AudioManagerBase::Shutdown() {
     AudioInputStream* stream = *iter++;
     stream->Close();
   }
-  CHECK(input_streams_.empty());
 #endif  // OS_MACOSX
 }