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Pepper CDM support is deprecated, so is ppapi CDM adapter binary. This
CL removes all CDM adapter related code from CdmHostFiles.

Also removes all CDM related code from PpapiThread, including CDM host
verification code that uses CdmHostFiles.

Bug: 772160
Change-Id: I727063d60eeccc60330c10c2fa9339bdc72813a3
Reviewed-on: https://chromium-review.googlesource.com/947923
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541579}