Remove some unnecessary stuff from AudioOutputDelegateImplUnitTest.

content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc

Index: content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc
diff --git a/content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc b/content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc
index 800a071329d957efc34b53096c9956e9c5215fc2..355cdce4a6aca0ba145371917fe871d9f6a47dca 100644
--- a/content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc
+++ b/content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc
@@ -16,12 +16,10 @@
 #include "base/run_loop.h"
 #include "content/browser/audio_manager_thread.h"
 #include "content/browser/media/capture/audio_mirroring_manager.h"
-#include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/media_observer.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "media/audio/audio_output_controller.h"
-#include "media/audio/audio_system_impl.h"
 #include "media/audio/fake_audio_log_factory.h"
 #include "media/audio/fake_audio_manager.h"
 #include "media/base/media_switches.h"
@@ -33,12 +31,6 @@ using ::testing::InSequence;
 using ::testing::NotNull;
 using ::testing::StrictMock;
 
-// TODO(maxmorin): not yet tested:
-// - Interactions with AudioStreamMonitor (goes through WebContentsImpl,
-//   so it's a bit tricky).
-// - Logging (small risk of bugs, not worth the effort).
-// - That the returned socket/memory is correctly set up.
-
 namespace content {
 
 namespace {
@@ -116,9 +108,6 @@ class AudioOutputDelegateTest : public testing::Test {
     audio_manager_.reset(new media::FakeAudioManager(
         audio_thread_->task_runner(), audio_thread_->worker_task_runner(),
         &log_factory_));
-    audio_system_ = media::AudioSystemImpl::Create(audio_manager_.get());
-    media_stream_manager_ =
-        base::MakeUnique<MediaStreamManager>(audio_system_.get());
   }
 
   // Test bodies are here, so that we can run them on the IO thread.
@@ -446,13 +435,9 @@ class AudioOutputDelegateTest : public testing::Test {
   }
 
  protected:
-  // MediaStreamManager uses a DestructionObserver, so it must outlive the
-  // TestBrowserThreadBundle.
-  std::unique_ptr<MediaStreamManager> media_stream_manager_;
   std::unique_ptr<TestBrowserThreadBundle> thread_bundle_;
   std::unique_ptr<AudioManagerThread> audio_thread_;
   media::ScopedAudioManagerPtr audio_manager_;
-  std::unique_ptr<media::AudioSystem> audio_system_;
   StrictMock<MockAudioMirroringManager> mirroring_manager_;
   StrictMock<MockEventHandler> event_handler_;
   StrictMock<MockObserver> media_observer_;