sdp: log unhandled lines at LS_VERBOSE level

for consistency with
  https://webrtc-review.googlesource.com/c/src/+/196526

Bug: None
Change-Id: Iddeb5e1639444e855e61d10d13c7a741916b658e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196642
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32802}
diff --git a/pc/webrtc_sdp.cc b/pc/webrtc_sdp.cc
index 6f91d63..b500eb2 100644
--- a/pc/webrtc_sdp.cc
+++ b/pc/webrtc_sdp.cc
@@ -3280,12 +3280,12 @@
         continue;
       } else {
         // Unrecognized attribute in RTP protocol.
-        RTC_LOG(LS_INFO) << "Ignored line: " << line;
+        RTC_LOG(LS_VERBOSE) << "Ignored line: " << line;
         continue;
       }
     } else {
       // Only parse lines that we are interested of.
-      RTC_LOG(LS_INFO) << "Ignored line: " << line;
+      RTC_LOG(LS_VERBOSE) << "Ignored line: " << line;
       continue;
     }
   }