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

Review URL: https://codereview.chromium.org/583833007

git-svn-id: svn://svn.chromium.org/blink/trunk@182379 bbb929c8-8fbe-4397-9dbb-9b2b20218538