Register header extensions in RtpRtcpObserver to avoid log spam.

webrtc/video/video_quality_test.cc

Index: webrtc/video/video_quality_test.cc
diff --git a/webrtc/video/video_quality_test.cc b/webrtc/video/video_quality_test.cc
index 3e4bbdbbd5c52a24942ccc97ecc1edeb817f47b1..0f45fa663230770006dd04881bf4da40c09551f1 100644
--- a/webrtc/video/video_quality_test.cc
+++ b/webrtc/video/video_quality_test.cc
@@ -32,8 +32,6 @@
 
 namespace webrtc {
 
-static const int kTransportSeqExtensionId =
-    VideoQualityTest::kAbsSendTimeExtensionId + 1;
 static const int kSendStatsPollingIntervalMs = 1000;
 static const int kPayloadTypeVP8 = 123;
 static const int kPayloadTypeVP9 = 124;
@@ -628,11 +626,12 @@ void VideoQualityTest::SetupFullStack(const Params& params,
 
   send_config_.rtp.extensions.clear();
   if (params.common.send_side_bwe) {
-    send_config_.rtp.extensions.push_back(RtpExtension(
-        RtpExtension::kTransportSequenceNumber, kTransportSeqExtensionId));
-  } else {
     send_config_.rtp.extensions.push_back(
-        RtpExtension(RtpExtension::kAbsSendTime, kAbsSendTimeExtensionId));
+        RtpExtension(RtpExtension::kTransportSequenceNumber,
+                     test::kTransportSequenceNumberExtensionId));
+  } else {
+    send_config_.rtp.extensions.push_back(RtpExtension(
+        RtpExtension::kAbsSendTime, test::kAbsSendTimeExtensionId));
   }
 
   // Automatically fill out streams[0] with params.