Revert of Cast:Adding cast_transport_config and cleaning up

media/cast/audio_sender/audio_sender_unittest.cc

Index: media/cast/audio_sender/audio_sender_unittest.cc
diff --git a/media/cast/audio_sender/audio_sender_unittest.cc b/media/cast/audio_sender/audio_sender_unittest.cc
index 419745640cc9f6c80cd4b69a3f690b73e7456421..779695088da3bb6c4239e085e09f5e0bfb2ca488 100644
--- a/media/cast/audio_sender/audio_sender_unittest.cc
+++ b/media/cast/audio_sender/audio_sender_unittest.cc
@@ -38,9 +38,9 @@
   virtual void SetUp() {
     task_runner_ = new test::FakeTaskRunner(&testing_clock_);
     cast_environment_ = new CastEnvironment(&testing_clock_, task_runner_,
-        task_runner_, task_runner_, task_runner_, task_runner_, task_runner_,
+        task_runner_, task_runner_, task_runner_, task_runner_,
         GetDefaultCastLoggingConfig());
-    audio_config_.codec = transport::kOpus;
+    audio_config_.codec = kOpus;
     audio_config_.use_external_encoder = false;
     audio_config_.frequency = kDefaultAudioSamplingRate;
     audio_config_.channels = 2;