pbos 081af25c11 Remove kProtectionKey* and VCMKeyRequestMode.
Enforces previous kProtectionKeyOnLoss as the permanent method which was
the only one used in use. This simplifies SetVideoProtection and
transition over to SetReceiverRobustnessMode.

BUG=webrtc:1596
R=stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1244753002

Cr-Commit-Position: refs/heads/master@{#9641}
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