AX_ROLE_HORIZONTAL_RULE is not required.

AX_ROLE_HORIZONTAL_RULE is not required.

There is already SplitterRole defined in blink, so better to remove HorizontalRuleRole from blink and return SplitterRole for hr tag.
This patch makes the changes in chromium side.

This CL would be followed by one blink CL which will remove the defined redundant role in blink side and one chromium CL after that to enable AX test and exposing correctly on MAC platform.

BUG=384723
Committed: https://crrev.com/fc47ce190a01e2a5cb5a38a38303c53047839afc
Cr-Commit-Position: refs/heads/master@{#303364}

[shreeramk, 2014-11-07 03:50:59]

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

[shreeramk, 2014-11-07 03:51:00]

PTAL. Thanks :)

[shreeramk, 2014-11-07 16:39:00]

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

[dmazzoni, 2014-11-08 00:48:30]

The CQ bit was checked by dmazzoni@chromium.org

[dmazzoni, 2014-11-08 00:48:30]

lgtm

[commit-bot: I haz the power, 2014-11-08 00:49:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/709523002/1

[commit-bot: I haz the power, 2014-11-08 02:52:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-11-08 02:54:17]

Patchset 1 (id:??) landed as
https://crrev.com/fc47ce190a01e2a5cb5a38a38303c53047839afc
Cr-Commit-Position: refs/heads/master@{#303364}