[Mac][Material Design] Fix problem with tab close button redraw.

[Mac][Material Design] Fix problem with tab close button redraw.

With a theme installed the close button's "x" can have a different
color for the tab active and inactive states. This cl forces the close
button to redraw on tab state change so that it displays the "x" in the
correct color.

R=tapted@chromium.org
BUG=616008
Committed: https://crrev.com/29bd2eed90a5c548ce737aa09225952bfab22461
Cr-Commit-Position: refs/heads/master@{#400162}

[shrike, 2016-06-15 21:19:30]

PTAL

[tapted, 2016-06-16 05:29:55]

lgtm

[shrike, 2016-06-16 15:02:57]

The CQ bit was checked by shrike@chromium.org

[commit-bot: I haz the power, 2016-06-16 15:03:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2073523002/1

[commit-bot: I haz the power, 2016-06-16 15:40:35]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-16 15:43:13]

Description was changed from

==========
[Mac][Material Design] Fix problem with tab close button redraw.

With a theme installed the close button's "x" can have a different
color for the tab active and inactive states. This cl forces the close
button to redraw on tab state change so that it displays the "x" in the
correct color.

R=tapted@chromium.org
BUG=616008
==========

to

==========
[Mac][Material Design] Fix problem with tab close button redraw.

With a theme installed the close button's "x" can have a different
color for the tab active and inactive states. This cl forces the close
button to redraw on tab state change so that it displays the "x" in the
correct color.

R=tapted@chromium.org
BUG=616008

Committed: https://crrev.com/29bd2eed90a5c548ce737aa09225952bfab22461
Cr-Commit-Position: refs/heads/master@{#400162}
==========

[commit-bot: I haz the power, 2016-06-16 15:43:14]

Patchset 1 (id:??) landed as
https://crrev.com/29bd2eed90a5c548ce737aa09225952bfab22461
Cr-Commit-Position: refs/heads/master@{#400162}