Revert of Optimize all Chrome for Android PNG assets. (patchset #1 id:1 of https://chromiumcodereview.appspot.com/889683002/)

Reason for revert:
Images got corrupted

Original issue's description:
> Optimize all Chrome for Android PNG assets.
>
> This change decreases our APK size by 67,065 bytes.
>
> R=newt@chromium.org
> TBR=tedchoc@chromium.org
> BUG=407781
>
> Committed: https://chromium.googlesource.com/chromium/src/+/3952cc4232da78710734333340ae3181d5c20031

TBR=newt@chromium.org,tedchoc@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=407781

Review URL: https://codereview.chromium.org/885743003

Cr-Commit-Position: refs/heads/master@{#313804}