Be able to build cast_unittest and related targets in Chrome tree

media/cast/rtcp/mock_rtcp_receiver_feedback.h

Index: media/cast/rtcp/mock_rtcp_receiver_feedback.h
diff --git a/media/cast/rtcp/mock_rtcp_receiver_feedback.h b/media/cast/rtcp/mock_rtcp_receiver_feedback.h
index 09e2cb4faf55ab0d222c5347e45318b6f1fc9404..acde0560bb9c8caca94003708e74732bb24ad2df 100644
--- a/media/cast/rtcp/mock_rtcp_receiver_feedback.h
+++ b/media/cast/rtcp/mock_rtcp_receiver_feedback.h
@@ -15,6 +15,9 @@ namespace cast {
 
 class MockRtcpReceiverFeedback : public RtcpReceiverFeedback {
  public:
+  MockRtcpReceiverFeedback();
+  virtual ~MockRtcpReceiverFeedback();
+
   MOCK_METHOD1(OnReceivedSenderReport,
                void(const RtcpSenderInfo& remote_sender_info));
 
@@ -26,6 +29,9 @@ class MockRtcpReceiverFeedback : public RtcpReceiverFeedback {
 
 class MockRtcpRttFeedback : public RtcpRttFeedback {
  public:
+  MockRtcpRttFeedback();
+  virtual ~MockRtcpRttFeedback();
+
   MOCK_METHOD3(OnReceivedDelaySinceLastReport,
                void(uint32 media_ssrc,
                     uint32 last_report,