Remove FlexfecConfig and replace with specific struct in VideoSendStream.

webrtc/video/end_to_end_tests.cc

Index: webrtc/video/end_to_end_tests.cc
diff --git a/webrtc/video/end_to_end_tests.cc b/webrtc/video/end_to_end_tests.cc
index 367b74ce0e94297c84f22fc24572a7913ead44d0..946d81d5df7405f5f53ea7a3df5053d60e59d9fe 100644
--- a/webrtc/video/end_to_end_tests.cc
+++ b/webrtc/video/end_to_end_tests.cc
@@ -3864,10 +3864,11 @@ void VerifyEmptyUlpfecConfig(const UlpfecConfig& config) {
       << "Enabling RTX in ULPFEC requires rtpmap: rtx negotiation.";
 }
 
-void VerifyEmptyFlexfecConfig(const FlexfecConfig& config) {
-  EXPECT_EQ(-1, config.flexfec_payload_type)
+void VerifyEmptyFlexfecConfig(
+    const VideoSendStream::Config::Rtp::Flexfec& config) {
+  EXPECT_EQ(-1, config.payload_type)
       << "Enabling FlexFEC requires rtpmap: flexfec negotiation.";
-  EXPECT_EQ(0U, config.flexfec_ssrc)
+  EXPECT_EQ(0U, config.ssrc)
       << "Enabling FlexFEC requires ssrc-group: FEC-FR negotiation.";
   EXPECT_TRUE(config.protected_media_ssrcs.empty())
       << "Enabling FlexFEC requires ssrc-group: FEC-FR negotiation.";