This reverts commit 7b9ff4a0.

Reason for revert: ios build bots are red

Original change's description:
> tidy applied with readability-*
> 
> TBR=braveyao@chromium.org
> Bug: libyuv:750
> Test: builds and runs and passes more tidy tests
> Change-Id: I316822f7d13b370b88b92a693912e880b21f92c8
> Reviewed-on: https://chromium-review.googlesource.com/907371
> Reviewed-by: Frank Barchard <fbarchard@chromium.org>

TBR=fbarchard@chromium.org,braveyao@chromium.org

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

Bug: libyuv:750
Change-Id: I4a73ffee2b71664c6cb93f38f2b5d70ebd76953e
Reviewed-on: https://chromium-review.googlesource.com/912175Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>