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We'll never ship an update to x86-{alex, mario, zgb} again thus there's
no use in keeping the special cases around.

Bug: none
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I150a4b50d3347767f94dbc0e01019cef979a134f
Reviewed-on: https://chromium-review.googlesource.com/581188Reviewed-by: Valery Arkhangorodsky <varkha@chromium.org>
Reviewed-by: Daichi Hirono <hirono@chromium.org>
Commit-Queue: Thiemo Nagel <tnagel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491974}