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This folder contains "library CDM" related code and will soon be
unrelated to ppapi.

This CL only renames the folder. More clean-up will follow in later CLs.

TBR=thestig@chromium.org
BUG=769833

Change-Id: I346a59d23838d5d4cd93bfea5afd3f28827e147f
Reviewed-on: https://chromium-review.googlesource.com/889693
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532709}