GitLab

New ErrorPage tests use EmbeddedTestServer instead of relying on DNS
resolution error. Also new tests work with enabled WebErrorPages flag.

Bug: 725241
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Iad495dac2c5e3111809cf460c151187089b20698
Reviewed-on: https://chromium-review.googlesource.com/1101930Reviewed-by: Danyao Wang <danyao@chromium.org>
Commit-Queue: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567714}