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This reverts commit 1d5cb6af.

Reason for revert: Breaking v8 kitkat bots

Original change's description:
> Increase android32_ndk_api_level 16 -> 21
> 
> We only support 21+, so we should build for it.
> 
> Bug: 1116198
> Change-Id: I552a946b245de0f54485ea985e08b53b92186bb1
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2367984
> Reviewed-by: Ben Mason <benmason@chromium.org>
> Commit-Queue: Ben Mason <benmason@chromium.org>
> Auto-Submit: Andrew Grieve <agrieve@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#804976}

TBR=agrieve@chromium.org,benmason@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1116198, 1126469
Change-Id: Ia59936b975b6a17ec102fea02b9e86ba15de7b7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2401268Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805510}