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Today we always use hardware secure codecs for non-Widevine key systems.
This is DCHECKed in AndroidCdmFactory::Create() when we create
MediaDrmBridge for PlayReady key system. Also, in
MediaDrmBridge::IsSecureCodecRequired(), we always return true for
non-Widevine key systems including PlayReady.

This CL updates PlayReadyKeySystemProperties to always return
HW_SECURE_CODECS_REQUIRED in GetRobustnessConfigRule() for PlayReady key
system to make everything consistent.

BUG=577777

Change-Id: I7b94f5dc22fb8c98d7e17709f767c766ebd54858
Reviewed-on: https://chromium-review.googlesource.com/531855
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478835}