Replace NOTREACHED with a break.

The old format is still used.

Bug: None
Change-Id: I2c8c9a8c7b09282ba8c375403cbee7fd7ab2d056
Reviewed-on: https://webrtc-review.googlesource.com/c/122960
Reviewed-by: Björn Terelius <terelius@webrtc.org>
Commit-Queue: Björn Terelius <terelius@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26679}
diff --git a/logging/rtc_event_log/encoder/rtc_event_log_encoder_legacy.cc b/logging/rtc_event_log/encoder/rtc_event_log_encoder_legacy.cc
index 6aab870..4e8529c 100644
--- a/logging/rtc_event_log/encoder/rtc_event_log_encoder_legacy.cc
+++ b/logging/rtc_event_log/encoder/rtc_event_log_encoder_legacy.cc
@@ -365,7 +365,8 @@
     case RtcEvent::Type::GenericPacketReceived:
     case RtcEvent::Type::GenericPacketSent:
     case RtcEvent::Type::GenericAckReceived:
-      RTC_NOTREACHED();
+      // These are unsupported in the old format.
+      break;
   }
 
   int event_type = static_cast<int>(event.GetType());