Set RtcpSender transport at construction.

webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc

Index: webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc
diff --git a/webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc b/webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc
index 5b43f0092b63995e44a871ffbbb4b273c3cb26d8..f0d2a779ee9c0fee58dbdef84e817dddfbb142ba 100644
--- a/webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc
+++ b/webrtc/modules/rtp_rtcp/test/testAPI/test_api.cc
@@ -90,6 +90,7 @@ class RtpRtcpAPITest : public ::testing::Test {
     RtpRtcp::Configuration configuration;
     configuration.audio = true;
     configuration.clock = &fake_clock_;
+    configuration.outgoing_transport = &null_transport_;
     module_.reset(RtpRtcp::CreateRtpRtcp(configuration));
     rtp_payload_registry_.reset(new RTPPayloadRegistry(
             RTPPayloadStrategy::CreateStrategy(true)));
@@ -105,6 +106,14 @@ class RtpRtcpAPITest : public ::testing::Test {
   uint16_t test_sequence_number_;
   std::vector<uint32_t> test_csrcs_;
   SimulatedClock fake_clock_;
+  class NullTransport : public Transport {
+   public:
+    NullTransport() {}
+    virtual ~NullTransport() {}
+
+    int SendPacket(const void* data, size_t len) override { return 0; }
+    int SendRTCPPacket(const void* data, size_t len) override { return 0; }
+  } null_transport_;
 };
 
 TEST_F(RtpRtcpAPITest, Basic) {