ARIA role spinbutton should expose AXRole as AXIncrementor.

ARIA role spinbutton should expose AXRole as AXIncrementor.

According to latest editor's draft http://rawgit.com/w3c/aria/master/core-aam/core-aam.html
ARIA role spinbutton would be exposed as below on mac:

AXRole: AXIncrementor
AXSubrole: <nil>
AXRoleDescription: 'stepper'

In this CL, I am also removing Unused role 'Incrementor'.

BUG=385014
Committed: https://crrev.com/120e221d1ab712b1a070ffe401506afe54565a84
Cr-Commit-Position: refs/heads/master@{#303966}

[shreeramk, 2014-11-12 08:19:51]

@Dominic: PTAL.

This change https://codereview.chromium.org/718433002/ has been merged, but it
seems its not proper yet for input type number. (Because before returning
spinbuttonrole for input type number, blink is returning text role.)

So, removing input-number.html AX test.

Will soon upload a patch for the same.

[shreeramk, 2014-11-12 09:05:24]

shreeram.k@samsung.com changed reviewers:
+ dmazzoni@chromium.org

[dmazzoni, 2014-11-12 19:57:31]

lgtm

[shreeramk, 2014-11-13 01:35:49]

The CQ bit was checked by shreeram.k@samsung.com

[commit-bot: I haz the power, 2014-11-13 01:37:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/714063002/40001

[shreeramk, 2014-11-13 01:37:57]

The CQ bit was unchecked by shreeram.k@samsung.com

[shreeramk, 2014-11-13 01:38:21]

The CQ bit was checked by shreeram.k@samsung.com

[commit-bot: I haz the power, 2014-11-13 01:38:52]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/714063002/40001

[commit-bot: I haz the power, 2014-11-13 02:38:14]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2014-11-13 02:38:50]

Patchset 3 (id:??) landed as
https://crrev.com/120e221d1ab712b1a070ffe401506afe54565a84
Cr-Commit-Position: refs/heads/master@{#303966}