MSAA + (IA,IA2) role are not correctly exposed for html footer tag.

MSAA + (IA,IA2) role are not correctly exposed for html footer tag.

According to specs http://rawgit.com/w3c/aria/master/html-aam/html-aam.html
For html footer tag,

MSAA+IA Role: ROLE_SYSTEM_GROUPING
MSAA+IA2 Role: Role: IA2_ROLE_FOOTER

Also, there should be no STATE_SYSTEM_READONLY.

Committed: https://crrev.com/435016b55977c201df289fec02e9b48b253025ae
Cr-Commit-Position: refs/heads/master@{#303604}

[shreeramk, 2014-11-10 18:49:46]

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

[shreeramk, 2014-11-10 18:49:47]

@dmazzoni & @aboxhall: Please review.

Thanks!

[dmazzoni, 2014-11-11 06:39:20]

The CQ bit was checked by dmazzoni@chromium.org

[dmazzoni, 2014-11-11 06:39:21]

lgtm

[commit-bot: I haz the power, 2014-11-11 06:40:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/702943003/20001

[commit-bot: I haz the power, 2014-11-11 07:45:19]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-11-11 07:46:43]

Patchset 2 (id:??) landed as
https://crrev.com/435016b55977c201df289fec02e9b48b253025ae
Cr-Commit-Position: refs/heads/master@{#303604}