Refactor AudioInputController and related interfaces.

media/audio/test_audio_input_controller_factory.cc

Index: media/audio/test_audio_input_controller_factory.cc
diff --git a/media/audio/test_audio_input_controller_factory.cc b/media/audio/test_audio_input_controller_factory.cc
index 024e7adee732a2cd16c3be7420a4f42a5cfba86f..9e8c71f603856fac0404618a78a09db4cbcf4674 100644
--- a/media/audio/test_audio_input_controller_factory.cc
+++ b/media/audio/test_audio_input_controller_factory.cc
@@ -15,16 +15,15 @@ TestAudioInputController::TestAudioInputController(
     EventHandler* event_handler,
     SyncWriter* sync_writer,
     UserInputMonitor* user_input_monitor)
-    : AudioInputController(event_handler,
+    : AudioInputController(audio_manager->GetTaskRunner(),
+                           event_handler,
                            sync_writer,
                            nullptr,
                            user_input_monitor,
                            false),
       audio_parameters_(audio_parameters),
       factory_(factory),
-      event_handler_(event_handler) {
-  task_runner_ = audio_manager->GetTaskRunner();
-}
+      event_handler_(event_handler) {}
 
 TestAudioInputController::~TestAudioInputController() {
   // Inform the factory so that it allows creating new instances in future.
@@ -37,7 +36,7 @@ void TestAudioInputController::Record() {
 }
 
 void TestAudioInputController::Close(const base::Closure& closed_task) {
-  task_runner_->PostTask(FROM_HERE, closed_task);
+  GetTaskRunnerForTesting()->PostTask(FROM_HERE, closed_task);
   if (factory_->delegate_)
     factory_->delegate_->TestAudioControllerClosed(this);
 }