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This should hopefully help reduce the number of requests when there is
no persistent store available so we don't keep fetching for the host if
we know that there was no hint available for it from the server during
the session.

Bug: 1112500
Change-Id: I6b7514bba0a96fa13866b55287f091ef4201a3f4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364081Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799771}