Be able to build cast_unittest and related targets in Chrome tree

media/cast/pacing/mock_paced_packet_sender.cc

Index: media/cast/pacing/mock_paced_packet_sender.cc
diff --git a/media/filters/gpu_video_accelerator_factories.cc b/media/cast/pacing/mock_paced_packet_sender.cc
similarity index 51%
copy from media/filters/gpu_video_accelerator_factories.cc
copy to media/cast/pacing/mock_paced_packet_sender.cc
index f9f56604d251376fdd3182b52dee0ec252114c0a..2b79d9fba75e685431512c8164a528c52fe64573 100644
--- a/media/filters/gpu_video_accelerator_factories.cc
+++ b/media/cast/pacing/mock_paced_packet_sender.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/pacing/mock_paced_packet_sender.h"
 
 namespace media {
+namespace cast {
 
-GpuVideoAcceleratorFactories::~GpuVideoAcceleratorFactories() {}
+MockPacedPacketSender::MockPacedPacketSender() {
+}
 
+MockPacedPacketSender::~MockPacedPacketSender() {
+}
+
+}  // namespace cast
 }  // namespace media