Revert of Pass task runners to AudioManager constructor.

content/browser/renderer_host/media/audio_output_device_enumerator_unittest.cc

Index: content/browser/renderer_host/media/audio_output_device_enumerator_unittest.cc
diff --git a/content/browser/renderer_host/media/audio_output_device_enumerator_unittest.cc b/content/browser/renderer_host/media/audio_output_device_enumerator_unittest.cc
index c84a6845b0a08445398d9ea204fcca5179a07d30..f84f87e2bd0ad62bde2f114b1a7332f9d8e490a2 100644
--- a/content/browser/renderer_host/media/audio_output_device_enumerator_unittest.cc
+++ b/content/browser/renderer_host/media/audio_output_device_enumerator_unittest.cc
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/thread_task_runner_handle.h"
 #include "content/public/test/test_browser_thread_bundle.h"
@@ -30,10 +31,7 @@
 class MockAudioManager : public media::FakeAudioManager {
  public:
   MockAudioManager(size_t num_devices)
-      : FakeAudioManager(base::ThreadTaskRunnerHandle::Get(),
-                         base::ThreadTaskRunnerHandle::Get(),
-                         &fake_audio_log_factory_),
-        num_devices_(num_devices) {}
+      : FakeAudioManager(&fake_audio_log_factory_), num_devices_(num_devices) {}
   MockAudioManager() : MockAudioManager(0) {}
   ~MockAudioManager() override {}
 
@@ -83,7 +81,9 @@
 
 class AudioOutputDeviceEnumeratorTest : public ::testing::Test {
  public:
-  AudioOutputDeviceEnumeratorTest() {}
+  AudioOutputDeviceEnumeratorTest()
+      : thread_bundle_(), task_runner_(base::ThreadTaskRunnerHandle::Get()) {}
+
   ~AudioOutputDeviceEnumeratorTest() override {}
 
   MOCK_METHOD1(MockCallback, void(const AudioOutputDeviceEnumeration&));
@@ -110,19 +110,18 @@
                               const AudioOutputDeviceEnumeration& result) {
     EXPECT_EQ(actual_devices_expected, result.has_actual_devices);
     EXPECT_EQ(num_entries_expected, result.devices.size());
-    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
-                                                  run_loop_.QuitClosure());
+    task_runner_->PostTask(FROM_HERE, run_loop_.QuitClosure());
   }
 
   void QuitCallback(const AudioOutputDeviceEnumeration& result) {
     MockCallback(result);
-    base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
-                                                  run_loop_.QuitClosure());
+    task_runner_->PostTask(FROM_HERE, run_loop_.QuitClosure());
   }
 
  protected:
+  std::unique_ptr<MockAudioManager> audio_manager_;
   TestBrowserThreadBundle thread_bundle_;
-  std::unique_ptr<MockAudioManager, media::AudioManagerDeleter> audio_manager_;
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   base::RunLoop run_loop_;
 
  private: