Remove HTMLInputElement::isText and isTextType.

Remove HTMLInputElement::isText and isTextType.

They are same and very confusing.
isText is used outside of HTMLInputElement.  It can be replaced with
|isTextField() && type() != InputTypeNames::number|.
isTextType is used only in HTMLInputElement. Its callsites should be
replaced with virtual function dispatches.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181614

[tkent, 2014-09-09 04:40:21]

Patchset #1 (id:1) has been deleted

[tkent, 2014-09-09 06:11:00]

tkent@chromium.org changed reviewers:
+ keishi@chromium.org

[tkent, 2014-09-09 06:11:01]

Please review this.

[keishi, 2014-09-09 07:39:29]

lgtm

[tkent, 2014-09-09 07:41:18]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-09-09 07:42:28]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tkent@chromium.org/551283002/20001

[commit-bot: I haz the power, 2014-09-09 07:45:50]

Committed patchset #1 (id:20001) as 181614