Fix code style and gyp files in cast to build cast_unittest

media/cast/rtcp/mock_rtcp_sender_feedback.cc

Index: media/cast/rtcp/mock_rtcp_sender_feedback.cc
diff --git a/media/filters/gpu_video_accelerator_factories.cc b/media/cast/rtcp/mock_rtcp_sender_feedback.cc
similarity index 51%
copy from media/filters/gpu_video_accelerator_factories.cc
copy to media/cast/rtcp/mock_rtcp_sender_feedback.cc
index f9f56604d251376fdd3182b52dee0ec252114c0a..65c630148c2b57b14f076d5b4e676abac4196639 100644
--- a/media/filters/gpu_video_accelerator_factories.cc
+++ b/media/cast/rtcp/mock_rtcp_sender_feedback.cc
@@ -2,10 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/filters/gpu_video_accelerator_factories.h"
+#include "media/cast/rtcp/mock_rtcp_sender_feedback.h"
 
 namespace media {
+namespace cast {
 
-GpuVideoAcceleratorFactories::~GpuVideoAcceleratorFactories() {}
+MockRtcpSenderFeedback::MockRtcpSenderFeedback() {
+}
 
+MockRtcpSenderFeedback::~MockRtcpSenderFeedback() {
+}
+
+}  // namespace cast
 }  // namespace media