Browser test dry runs with mojo audio streams.

content/browser/renderer_host/media/renderer_audio_output_stream_factory_context_impl_unittest.cc

Index: content/browser/renderer_host/media/renderer_audio_output_stream_factory_context_impl_unittest.cc
diff --git a/content/browser/renderer_host/media/renderer_audio_output_stream_factory_context_impl_unittest.cc b/content/browser/renderer_host/media/renderer_audio_output_stream_factory_context_impl_unittest.cc
index 9d291bf31ea0b2020c2a34fd48e4ae4f685b4dbc..0dd2036cf472cfcbf775f80b6cfe0351737acbe4 100644
--- a/content/browser/renderer_host/media/renderer_audio_output_stream_factory_context_impl_unittest.cc
+++ b/content/browser/renderer_host/media/renderer_audio_output_stream_factory_context_impl_unittest.cc
@@ -308,15 +308,17 @@ class RendererAudioOutputStreamFactoryIntegrationTest : public Test {
     media_stream_manager_ =
         base::MakeUnique<MediaStreamManager>(audio_system_.get());
   }
+
   ~RendererAudioOutputStreamFactoryIntegrationTest() override {
     audio_manager_->Shutdown();
   }
 
-  void CreateAndBindFactory(AudioOutputStreamFactoryRequest request) {
+  UniqueAudioOutputStreamFactoryPtr CreateAndBindFactory(
+      AudioOutputStreamFactoryRequest request) {
     factory_context_.reset(new RendererAudioOutputStreamFactoryContextImpl(
         kRenderProcessId, audio_system_.get(), audio_manager_.get(),
         media_stream_manager_.get(), kSalt));
-    factory_context_->CreateFactory(kRenderFrameId, std::move(request));
+    return factory_context_->CreateFactory(kRenderFrameId, std::move(request));
   }
 
   std::unique_ptr<MediaStreamManager> media_stream_manager_;
@@ -342,11 +344,7 @@ TEST_F(RendererAudioOutputStreamFactoryIntegrationTest, StreamIntegrationTest) {
       .WillOnce(Return(stream));
 
   AudioOutputStreamFactoryPtr factory_ptr;
-  BrowserThread::PostTask(
-      BrowserThread::IO, FROM_HERE,
-      base::BindOnce(&RendererAudioOutputStreamFactoryIntegrationTest::
-                         CreateAndBindFactory,
-                     base::Unretained(this), mojo::MakeRequest(&factory_ptr)));
+  auto factory_handle = CreateAndBindFactory(mojo::MakeRequest(&factory_ptr));
 
   AudioOutputStreamProviderPtr provider_ptr;
   base::RunLoop loop;