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Temporary grants permisson of PROTECTED_MEDIA_IDENTIFIER, to unblock EME
dev.

Bug: 922833
Bug: 966191
Test: Build and pages with EME
Change-Id: I853719d74ee04a1bbc0e7d4768d17aa208147ab7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1646632
Commit-Queue: Yuchen Liu <yucliu@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#666456}