Convert implicit scoped_refptr constructor calls to explicit ones, part 1

media/audio/audio_input_controller.cc

Index: media/audio/audio_input_controller.cc
diff --git a/media/audio/audio_input_controller.cc b/media/audio/audio_input_controller.cc
index fc4b97df67fc61b8d89b5e2d003b5451723e799c..45ab2c404043a1e892562b093d9fad6f86fc35cd 100644
--- a/media/audio/audio_input_controller.cc
+++ b/media/audio/audio_input_controller.cc
@@ -42,8 +42,8 @@ scoped_refptr<AudioInputController> AudioInputController::Create(
     return factory_->Create(event_handler, params, samples_per_packet);
   }
 
-  scoped_refptr<AudioInputController> controller = new AudioInputController(
-      event_handler);
+  scoped_refptr<AudioInputController> controller(new AudioInputController(
+      event_handler));
 
   // Start the thread and post a task to create the audio input stream.
   controller->thread_.Start();