Revert of Pass task runners to AudioManager constructor.

media/audio/alsa/alsa_output_unittest.cc

Index: media/audio/alsa/alsa_output_unittest.cc
diff --git a/media/audio/alsa/alsa_output_unittest.cc b/media/audio/alsa/alsa_output_unittest.cc
index acf6d2881552324f3d582fcd34e9f15a1cba6934..1b1386347f9437c21865c9fa64b71936090ee735 100644
--- a/media/audio/alsa/alsa_output_unittest.cc
+++ b/media/audio/alsa/alsa_output_unittest.cc
@@ -5,10 +5,7 @@
 #include <stdint.h>
 
 #include "base/macros.h"
-#include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
-#include "base/test/test_message_loop.h"
-#include "base/thread_task_runner_handle.h"
 #include "media/audio/alsa/alsa_output.h"
 #include "media/audio/alsa/alsa_wrapper.h"
 #include "media/audio/alsa/audio_manager_alsa.h"
@@ -75,10 +72,7 @@
 
 class MockAudioManagerAlsa : public AudioManagerAlsa {
  public:
-  MockAudioManagerAlsa()
-      : AudioManagerAlsa(base::ThreadTaskRunnerHandle::Get(),
-                         base::ThreadTaskRunnerHandle::Get(),
-                         &fake_audio_log_factory_) {}
+  MockAudioManagerAlsa() : AudioManagerAlsa(&fake_audio_log_factory_) {}
   MOCK_METHOD0(Init, void());
   MOCK_METHOD0(HasAudioOutputDevices, bool());
   MOCK_METHOD0(HasAudioInputDevices, bool());
@@ -97,6 +91,12 @@
   void ReleaseOutputStream(AudioOutputStream* stream) override {
     DCHECK(stream);
     delete stream;
+  }
+
+  // We don't mock this method since all tests will do the same thing
+  // and use the current task runner.
+  scoped_refptr<base::SingleThreadTaskRunner> GetTaskRunner() override {
+    return base::MessageLoop::current()->task_runner();
   }
 
  private:
@@ -168,10 +168,9 @@
   static void* kFakeHints[];
   static char kGenericSurround50[];
 
-  base::TestMessageLoop message_loop_;
   StrictMock<MockAlsaWrapper> mock_alsa_wrapper_;
-  std::unique_ptr<StrictMock<MockAudioManagerAlsa>, AudioManagerDeleter>
-      mock_manager_;
+  scoped_ptr<StrictMock<MockAudioManagerAlsa> > mock_manager_;
+  base::MessageLoop message_loop_;
   scoped_refptr<media::DataBuffer> packet_;
 
  private:
@@ -443,7 +442,7 @@
   // call Stop() immediately after to ensure we don't run the message loop
   // forever.
   test_stream->Stop();
-  base::RunLoop().RunUntilIdle();
+  message_loop_.RunUntilIdle();
 
   EXPECT_CALL(mock_alsa_wrapper_, PcmClose(kFakeHandle))
       .WillOnce(Return(0));