Bug 1734573 - Call errorCheck after onStartRequest, r=mixedpuppy

      lastActivity &&

      lastActivity !== this.GOOD_LAST_ACTIVITY

    ) {

      // Make a trip through the event loop to make sure errors have a

      // chance to be processed before we fall back to a generic error

      // string.

      Services.tm.dispatchToMainThread(() => {

        channel.errorCheck();

      // Since the channel's security info is assigned in onStartRequest and

      // errorCheck is called in ChannelWrapper::onStartRequest, we should check

      // the errorString after onStartRequest to make sure errors have a chance

      // to be processed before we fall back to a generic error string.

      let onStart = function() {

        channel.removeEventListener("start", onStart);

        if (!channel.errorString) {

          this.runChannelListener(channel, "onErrorOccurred", {

            error:

              `NS_ERROR_NET_UNKNOWN_${lastActivity}`,

          });

        }

      });

      };

      channel.addEventListener("start", onStart);

    } else if (

      lastActivity !== this.GOOD_LAST_ACTIVITY &&

      lastActivity !==