Cast:Adding cast_transport_config and cleaning up

media/cast/transport/pacing/paced_sender.h

Index: media/cast/transport/pacing/paced_sender.h
diff --git a/media/cast/transport/pacing/paced_sender.h b/media/cast/transport/pacing/paced_sender.h
index 2f91a464dd5065e7180a115c61a48950eb951fda..c8a70c340f091a474c82301f70afc2186f895915 100644
--- a/media/cast/transport/pacing/paced_sender.h
+++ b/media/cast/transport/pacing/paced_sender.h
@@ -15,8 +15,8 @@
 #include "base/time/default_tick_clock.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
-#include "media/cast/cast_config.h"
-#include "media/cast/cast_environment.h"
+#include "media/cast/cast_config.h"  // PacketSender
+#include "media/cast/transport/cast_transport_config.h"
 
 namespace media {
 namespace cast {
@@ -39,8 +39,9 @@ class PacedSender : public PacedPacketSender,
                     public base::NonThreadSafe,
                     public base::SupportsWeakPtr<PacedSender> {
  public:
-  PacedSender(scoped_refptr<CastEnvironment> cast_environment,
-              PacketSender* transport);
+  PacedSender(base::TickClock* clock,
+              PacketSender* transport,
+              scoped_refptr<base::TaskRunner> transport_thread);
   virtual ~PacedSender();
 
   virtual bool SendPackets(const PacketList& packets) OVERRIDE;
@@ -63,8 +64,10 @@ class PacedSender : public PacedPacketSender,
   void SendStoredPackets();
   void UpdateBurstSize(size_t num_of_packets);
 
-  scoped_refptr<CastEnvironment> cast_environment_;
+  // Not owned by this class.
+  base::TickClock* const clock_;
   PacketSender* transport_;
+  scoped_refptr<base::TaskRunner> transport_thread_;
 
   size_t burst_size_;
   size_t packets_sent_in_burst_;