Revert of Optimize all Chrome for Android PNG assets.

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
Committed: https://crrev.com/a99e74390f1ad5646783f45d6577b337814d6772
Cr-Commit-Position: refs/heads/master@{#313804}

[aurimas (slooooooooow), 2015-01-29 22:10:31]

The CQ bit was checked by aurimas@chromium.org

[commit-bot: I haz the power, 2015-01-29 22:11:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/885743003/1

[commit-bot: I haz the power, 2015-01-29 22:14:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-29 22:15:34]

Patchset 1 (id:??) landed as
https://crrev.com/a99e74390f1ad5646783f45d6577b337814d6772
Cr-Commit-Position: refs/heads/master@{#313804}

[jdduke (slow), 2015-01-30 22:57:43]

On 2015/01/29 22:15:34, I haz the power (commit-bot) wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/a99e74390f1ad5646783f45d6577b337814d6772
> Cr-Commit-Position: refs/heads/master@{#313804}

[jdduke (slow), 2015-01-30 22:58:16]

On 2015/01/30 22:57:43, jdduke wrote:
> On 2015/01/29 22:15:34, I haz the power (commit-bot) wrote:
> > Patchset 1 (id:??) landed as
> > https://crrev.com/a99e74390f1ad5646783f45d6577b337814d6772
> > Cr-Commit-Position: refs/heads/master@{#313804}

Looks like this revert didn't include the modified assets in ui/ and content/.