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Now Widevine support is controlled by "enable_widevine" gn arg and this
header is not used on Android at all.

These were missed from previous CLs.

Bug: 349182
Test: No functionality change.
Change-Id: I651ec23a394d566c78a6c43e6cc9e06ff18d17fc
Reviewed-on: https://chromium-review.googlesource.com/1256005
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595662}