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Also fixes a missing init in Mac server and a threading assert in Mac
DMG installation.

Also simplifies some integration testing.

Bug: 1122739, 1063435
Change-Id: I73b30e36aa5d18cbd4618717a8b617538843f08b
Fixed: 1122739
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410818
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807022}