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This is a cleanup that removes unused "android" attribute:

1) cr_button does not support this attribute anymore, so
it does not have sense to have it in oobe_buttons.

2) There is no code that uses this attribute for oobe dialogs,
so it can be safely removed.

android attribute was introduced to make sure Assistant buttons
were looking android-like about 2 years ago.

TBR=alemate@chromium.org

Bug: 1000606
Change-Id: I97f1988de91c8945f915110c705e9cc2b83697e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789706
Commit-Queue: Denis Kuznetsov <antrim@chromium.org>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Auto-Submit: Denis Kuznetsov <antrim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695575}