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The USE flag for CHROMEOS_PROTECTED_MEDIA will be turned on before we
have encrypted content handling done here, so reject that config in all
cases until that is done.

BUG=b:153111783
TEST=Builds

Change-Id: Ibcd83a91ab83ef30afd01bbe7db6b5c792f474a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2495801
Auto-Submit: Jeffrey Kardatzke <jkardatzke@google.com>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820482}