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This CL unifies the behaviour and test expectations for the Download
Manager on Linux platforms.

Bug: 1109690
Change-Id: I45802dbc640c25b2b64384b5bfeb1dfccc9983e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2465855
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Auto-Submit: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/master@{#816599}