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We assign the priority as FOREGROUND if there is any pending force
installed extension. Then for the enabled/disabled extensions, we set
the priority as FOREGROUND in this case. This causes a  high rate of
"ondemand" updates for certain extensions. This CL fixes this by
assigning FOREGROUND priority only in case of first installs.

Bug: 1133407
Change-Id: I7b6e84e22c240ead798eb6f625ef3c26142c786f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2621893Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Swapnil Gupta <swapnilgupta@google.com>
Cr-Commit-Position: refs/heads/master@{#842601}