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ExtensionDownloader now reports to its delegate cache status
(hit/miss/outdated version) of the extension. We need it for later to
gather statistics and, in turn, to investigate how effectively cache
works, for example, for force-installed extensions.

Bug: 1015817
Change-Id: I22a0e73d2926f073a231fe13c73879608e2df7e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868881Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Commit-Queue: Oleg Davydov <burunduk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712086}