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These have only ever been used to support bindings-level state. There's
no need for the EDK to support this, and no need for the stable ABI to
expose a GetProperty call.

Bug: 819046
Change-Id: I94bdca21045590350f83914fa0429f8a96d7851d
Reviewed-on: https://chromium-review.googlesource.com/1036936Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555245}