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These includes are already removed on desktop platforms. Also remove it
on Android. This is in preparation for replacing WIDEVINE_CDM_AVAILABLE
with a buildflag.

TBR=jrummell@chromium.org

Bug: 349182
Test: No functionality change
Change-Id: I7f873247a3c986549caf4864fcb2efcc82918bc5
Reviewed-on: https://chromium-review.googlesource.com/1231925Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592630}