Use TintedImageButton for accessibility tab switcher.

Use TintedImageButton for accessibility tab switcher.

Close icon switched approved in crbug.com/455002

BUG=455002
Committed: https://crrev.com/be606d08268052fd205d27c873a9baffe3b0d6d7
Cr-Commit-Position: refs/heads/master@{#314650}

[aurimas (slooooooooow), 2015-02-04 00:52:01]

aurimas@chromium.org changed reviewers:
+ newt@chromium.org

[aurimas (slooooooooow), 2015-02-04 00:52:02]

newt: PTAL

The question about if we can use the different close (x) button is on
crbug.com/455002 and I will land this patch after that is answered.

[aurimas (slooooooooow), 2015-02-04 03:05:07]

Close icon change approved by sgabriel@. We are good to go!

[newt (away), 2015-02-04 21:36:09]

lgtm

[aurimas (slooooooooow), 2015-02-04 21:36:30]

The CQ bit was checked by aurimas@chromium.org

[commit-bot: I haz the power, 2015-02-04 21:38:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/894453004/20001

[commit-bot: I haz the power, 2015-02-04 21:59:09]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-04 22:00:57]

Patchset 2 (id:??) landed as
https://crrev.com/be606d08268052fd205d27c873a9baffe3b0d6d7
Cr-Commit-Position: refs/heads/master@{#314650}