Revert of Fix update of validity cache value, so that it reflects the correct state of any ...

Revert of Fix update of validity cache value, so that it reflects the correct state of any FormControlElement. (patchset #14 id:340001 of https://codereview.chromium.org/460343004/)

Reason for revert:
Caused regression in blink_perf. crbug.com/412054 

Original issue's description:
> Fix update of validity cache value, so that it reflects the correct
> state of FormControlElements.
> 
> This patch does a lazy update of validity, avoiding caching stale value.
> setNeedsValidityCheck() now does not update validity, but flags it for update.
> 
> BUG=400618, 403313
> TEST=LayoutTests/fast/forms/number/number-validity-badinput.html
> 
> Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181422

TBR=keishi@chromium.org,tkent@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=400618, 403313
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182379

[spartha, 2014-09-20 06:30:31]

Created Revert of Fix update of validity cache value, so that it reflects the
correct state of any FormControlElement.

[commit-bot: I haz the power, 2014-09-20 06:30:51]

The CQ bit was unchecked by commit-bot@chromium.org

[tkent, 2014-09-22 01:04:23]

lgtm.
I was surprised that it caused regression, instead of improvement.

[tkent, 2014-09-22 01:04:30]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-09-22 01:04:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/583833007/1

[commit-bot: I haz the power, 2014-09-22 01:05:27]

Committed patchset #1 (id:1) as 182379

[spartha, 2014-09-24 15:07:51]

On 2014/09/22 01:04:23, tkent (high review load) wrote:
> lgtm.
> I was surprised that it caused regression, instead of improvement.

The cause for the perf regression was the frequent style recalculation. I have
uploaded another patch https://codereview.chromium.org/601633004/ 
I check for change in validity to limit style update calls. This is similar to
older code, only that the validity value is cached in isValidFormControlElement
Please take a look and let me know if the approach is ok