Fix code style and gyp files in cast to build cast_unittest

media/cast/pacing/mock_packet_sender.cc

Index: media/cast/pacing/mock_packet_sender.cc
diff --git a/media/base/media_keys.cc b/media/cast/pacing/mock_packet_sender.cc
similarity index 55%
copy from media/base/media_keys.cc
copy to media/cast/pacing/mock_packet_sender.cc
index fd01de12f90d2b7923565d2e795fcedb5bcd4219..6c3fb44d4c7639c8f764e04ce6e37ee12a4f3088 100644
--- a/media/base/media_keys.cc
+++ b/media/cast/pacing/mock_packet_sender.cc
@@ -2,14 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/base/media_keys.h"
+#include "media/cast/pacing/mock_packet_sender.h"
 
 namespace media {
+namespace cast {
 
-MediaKeys::MediaKeys() {}
+MockPacketSender::MockPacketSender() {
+}
 
-MediaKeys::~MediaKeys() {}
-
-Decryptor* MediaKeys::GetDecryptor() { return NULL; }
+MockPacketSender::~MockPacketSender() {
+}
 
+}  // namespace cast
 }  // namespace media