Revert of Pass task runners to AudioManager constructor.

media/audio/audio_low_latency_input_output_unittest.cc

Index: media/audio/audio_low_latency_input_output_unittest.cc
diff --git a/media/audio/audio_low_latency_input_output_unittest.cc b/media/audio/audio_low_latency_input_output_unittest.cc
index 8a7728c59b2e64f4a5e1b4fc87f7f4f21d961ab2..010b34942099e6706e522a6d855f9e42b28f12bb 100644
--- a/media/audio/audio_low_latency_input_output_unittest.cc
+++ b/media/audio/audio_low_latency_input_output_unittest.cc
@@ -12,7 +12,6 @@
 #include "base/path_service.h"
 #include "base/synchronization/lock.h"
 #include "base/test/test_timeouts.h"
-#include "base/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "media/audio/audio_io.h"
@@ -97,11 +96,12 @@
 // the main thread instead of the audio thread.
 class MockAudioManager : public AudioManagerAnyPlatform {
  public:
-  MockAudioManager()
-      : AudioManagerAnyPlatform(base::ThreadTaskRunnerHandle::Get(),
-                                base::ThreadTaskRunnerHandle::Get(),
-                                &fake_audio_log_factory_) {}
+  MockAudioManager() : AudioManagerAnyPlatform(&fake_audio_log_factory_) {}
   ~MockAudioManager() override {}
+
+  scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() override {
+    return base::MessageLoop::current()->task_runner();
+  }
 
  private:
   FakeAudioLogFactory fake_audio_log_factory_;