Pass task runners to AudioManager constructor.

components/audio_modem/audio_recorder_unittest.cc

Index: components/audio_modem/audio_recorder_unittest.cc
diff --git a/components/audio_modem/audio_recorder_unittest.cc b/components/audio_modem/audio_recorder_unittest.cc
index e960cd389b5289ea42dfa1fdec74286f63cb71a0..4b0d44c000a2ffcfe441b26d6700786f0d353cb9 100644
--- a/components/audio_modem/audio_recorder_unittest.cc
+++ b/components/audio_modem/audio_recorder_unittest.cc
@@ -12,6 +12,7 @@
 #include "base/macros.h"
 #include "base/memory/aligned_memory.h"
 #include "base/run_loop.h"
+#include "base/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "components/audio_modem/audio_recorder_impl.h"
 #include "components/audio_modem/public/audio_modem_types.h"
@@ -82,8 +83,8 @@ namespace audio_modem {
 class AudioRecorderTest : public testing::Test {
  public:
   AudioRecorderTest() : total_samples_(0), recorder_(nullptr) {
-    if (!media::AudioManager::Get())
-      media::AudioManager::CreateForTesting();
+    audio_manager_ = media::AudioManager::CreateForTesting(
+        base::ThreadTaskRunnerHandle::Get());
   }
 
   ~AudioRecorderTest() override {
@@ -131,6 +132,7 @@ class AudioRecorderTest : public testing::Test {
       return;
     recorder_->Finalize();
     recorder_ = nullptr;
+    base::RunLoop().RunUntilIdle();
   }
 
   void RecordAndVerifySamples() {
@@ -183,10 +185,13 @@ class AudioRecorderTest : public testing::Test {
     return samples;
   }
   bool IsRecording() {
-    recorder_->FlushAudioLoopForTesting();
+    base::RunLoop().RunUntilIdle();
     return recorder_->is_recording_;
   }
 
+  content::TestBrowserThreadBundle thread_bundle_;
+  media::ScopedAudioManagerPtr audio_manager_;
+
   std::vector<float*> channel_data_;
   media::AudioParameters params_;
   size_t total_samples_;
@@ -197,7 +202,6 @@ class AudioRecorderTest : public testing::Test {
   std::string received_samples_;
 
   scoped_ptr<base::RunLoop> run_loop_;
-  content::TestBrowserThreadBundle thread_bundle_;
 };