Replace RTC_DCHECK(false) with RTC_NOTREACHED().

webrtc/api/webrtcsession.cc

Index: webrtc/api/webrtcsession.cc
diff --git a/webrtc/api/webrtcsession.cc b/webrtc/api/webrtcsession.cc
index e312c819f82ce4d1c4dd91e818c7bfd5fa745055..e662896fadf763a807fe9887f3e489a57dcf37ce 100644
--- a/webrtc/api/webrtcsession.cc
+++ b/webrtc/api/webrtcsession.cc
@@ -411,7 +411,7 @@ static std::string GetErrorCodeString(webrtc::WebRtcSession::Error err) {
     GET_STRING_OF_ERROR_CODE(ERROR_CONTENT)
     GET_STRING_OF_ERROR_CODE(ERROR_TRANSPORT)
     default:
-      RTC_DCHECK(false);
+      RTC_NOTREACHED();
       break;
   }
   return result;
@@ -1192,7 +1192,7 @@ cricket::IceConfig WebRtcSession::ParseIceConfig(
       gathering_policy = cricket::GATHER_CONTINUALLY;
       break;
     default:
-      RTC_DCHECK(false);
+      RTC_NOTREACHED();
       gathering_policy = cricket::GATHER_ONCE;
   }
   cricket::IceConfig ice_config;