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The content setting is confusing as it is "allow multiple downloads".
So in case an origin is blocked, we should still allow one download.
This CL also fixes an issue that on user gesture, download status
from other origins are reset although it should only reset the
status on the current page.

BUG=981966

Change-Id: I0519aa091446f2a2d81f4dcf074abf34849b9fe3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693552Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676121}