Only one implementation of MockRtpPacketSink once

webrtc/call/rtp_demuxer_unittest.cc

Index: webrtc/call/rtp_demuxer_unittest.cc
diff --git a/webrtc/call/rtp_demuxer_unittest.cc b/webrtc/call/rtp_demuxer_unittest.cc
index 8c2eab11bfd8dd2f34453b1df6f8d51eb1184652..552071aa8fc3d74285b40516188dd7643913a35e 100644
--- a/webrtc/call/rtp_demuxer_unittest.cc
+++ b/webrtc/call/rtp_demuxer_unittest.cc
@@ -14,7 +14,7 @@
 #include <string>
 
 #include "webrtc/call/rsid_resolution_observer.h"
-#include "webrtc/call/rtp_packet_sink_interface.h"
+#include "webrtc/call/rtp_packet_sink_interface_mock.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_header_extension_map.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_header_extensions.h"
@@ -35,11 +35,6 @@ using ::testing::AtLeast;
 using ::testing::InSequence;
 using ::testing::NiceMock;
 
-class MockRtpPacketSink : public RtpPacketSinkInterface {
- public:
-  MOCK_METHOD1(OnRtpPacket, void(const RtpPacketReceived&));
-};
-
 class MockRsidResolutionObserver : public RsidResolutionObserver {
  public:
   MOCK_METHOD2(OnRsidResolved, void(const std::string& rsid, uint32_t ssrc));