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We don't seem to use it, and it makes it easier to implement these
scripts without subprocess calls using just plistlib once on Py3.

Bug: 1147069
Change-Id: Iac7464b7767b2c221f3a63bf79708aa211147249
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554781Reviewed-by: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830519}