Adopt unsigned long constant type into DOM

Adopt unsigned long constant type into DOM

This CL made DOM understand unsigned long type what previously
had been recognized as int.

In addition, with this change, a failed test case will be passed in
http://w3c-test.org/dom/traversal/NodeFilter-constants.html

TEST=LayoutTests/fast/dom/constants.html

Behavior in other browsers:
*)FF: PASS
*)IE: PASS

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=178025

[kangil_, 2014-07-14 03:59:15]

PTAL

[haraken, 2014-07-14 04:23:13]

LGTM

[kangil_, 2014-07-14 04:27:24]

The CQ bit was checked by kangil.han@samsung.com

[commit-bot: I haz the power, 2014-07-14 04:28:02]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kangil.han@samsung.com/387263003/1

[commit-bot: I haz the power, 2014-07-14 05:24:37]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/16667)

[commit-bot: I haz the power, 2014-07-14 05:53:05]

Change committed as 178025