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It's preferred to use the common/well-known abbreviations directly
instead of its full name whenever it's possible in Chromium.

This CL is unifying the usage of PSM abbreviation everywhere PSM is
being used, instead of it's full name. That is going to make a lot
of PSM related tests more readable. Before that, it was
suffering from long tests names which made it difficult to read.

BUG=chromium:1168699

Change-Id: I4c8202800e9a896a63ca448917315eb8f57f6357
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642617
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845973}