Cast:Adding cast_transport_config and cleaning up

media/cast/cast_environment.h

Index: media/cast/cast_environment.h
diff --git a/media/cast/cast_environment.h b/media/cast/cast_environment.h
index 8a135733c04ef3840242c4539b377ad65e175014..0de9330917bc3ebe9401f4fdc72fa474aeda062c 100644
--- a/media/cast/cast_environment.h
+++ b/media/cast/cast_environment.h
@@ -65,15 +65,15 @@ class CastEnvironment : public base::RefCountedThreadSafe<CastEnvironment> {
   // Logging is not thread safe. Should always be called from the main thread.
   LoggingImpl* Logging();
 
+  scoped_refptr<base::TaskRunner> GetMessageTaskRunnerForThread(
+      ThreadId identifier);
+
  protected:
   virtual ~CastEnvironment();
 
  private:
   friend class base::RefCountedThreadSafe<CastEnvironment>;
 
-  scoped_refptr<base::TaskRunner> GetMessageTaskRunnerForThread(
-      ThreadId identifier);
-
   base::TickClock* const clock_;  // Not owned by this class.
   scoped_refptr<base::TaskRunner> main_thread_proxy_;
   scoped_refptr<base::TaskRunner> audio_encode_thread_proxy_;