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Source absolute paths //a/b/c are now supported, so no need
to use ../../../../../a/b/c

This migrates several tests where it is an easy change.

Change-Id: Ia7a8ba50a20a9b218e4b271c25449e3064148e55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1578616Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Commit-Queue: A Olsen <olsen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653644}