Fix the fuzz test.

webrtc/pc/jsepsessiondescription.cc

Index: webrtc/pc/jsepsessiondescription.cc
diff --git a/webrtc/pc/jsepsessiondescription.cc b/webrtc/pc/jsepsessiondescription.cc
index 457faafd910a123cb8f5bff24d70c179f3af539e..ab3452844152c62cfd48688c1156c569e4c22024 100644
--- a/webrtc/pc/jsepsessiondescription.cc
+++ b/webrtc/pc/jsepsessiondescription.cc
@@ -59,7 +59,7 @@ static int GetCandidatePreferenceFromType(const std::string& type) {
   } else if (type == cricket::RELAY_PORT_TYPE) {
     preference = kPreferenceRelayed;
   } else {
-    RTC_NOTREACHED();
+    preference = kPreferenceUnknown;
   }
   return preference;
 }