When the HSTS preload script was reworked to use async/await in bug 1436369,
`fetchstatus` would create an asynchronous xml http request and then attempt to
access a response header from it. However, there was nothing to ensure that the
request had completed before this code ran. This patch ensures that the request
has completed before the response header is used.
This patch also replaces a lingering instance of `Ci.nsISSLStatusProvider` that
should have been changed to `Ci.nsITransportSecurityInfo` in bug 1475647.
Finally, this patch removes the old, redundant getHSTSPreloadList.js in
security/manager/tools as well as the unused nsSTSPreloadList.errors file in
security/manager/ssl.
Differential Revision: https://phabricator.services.mozilla.com/D2807
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extra : moz-landing-system : lando
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