Remove FlexfecConfig and replace with specific struct in VideoSendStream.

webrtc/video/send_statistics_proxy_unittest.cc

Index: webrtc/video/send_statistics_proxy_unittest.cc
diff --git a/webrtc/video/send_statistics_proxy_unittest.cc b/webrtc/video/send_statistics_proxy_unittest.cc
index 7fa3ae36383573f33e683d59324b855cae3c459a..915b8df17789ecc8b1d170063408739596cfb3fa 100644
--- a/webrtc/video/send_statistics_proxy_unittest.cc
+++ b/webrtc/video/send_statistics_proxy_unittest.cc
@@ -75,8 +75,8 @@ class SendStatisticsProxyTest : public ::testing::Test {
     config.rtp.ssrcs.push_back(kSecondSsrc);
     config.rtp.rtx.ssrcs.push_back(kFirstRtxSsrc);
     config.rtp.rtx.ssrcs.push_back(kSecondRtxSsrc);
-    config.rtp.flexfec.flexfec_payload_type = 50;
-    config.rtp.flexfec.flexfec_ssrc = kFlexFecSsrc;
+    config.rtp.flexfec.payload_type = 50;
+    config.rtp.flexfec.ssrc = kFlexFecSsrc;
     return config;
   }