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ErrorRetryStateMachine is meant to manage the displaying of error pages
when a navigation fails and retrying the original URL when user
navigates back to an error page. SSL interstitial and other errors that
do not load error page (e.g. canceled navigation) should not modify an
item's ErrorRetryStateMachine to avoid trigger the error retry logic
when user navigates back to such an item.

Bug: 837210
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I8dfd11821dfb8cb9ee6f10820b88499c915d1994
Reviewed-on: https://chromium-review.googlesource.com/1151949
Commit-Queue: Danyao Wang <danyao@chromium.org>
Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579089}