[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
Review-Url: https://codereview.chromium.org/2073523002
Cr-Commit-Position: refs/heads/master@{#400162}
(cherry picked from commit 29bd2eed90a5c548ce737aa09225952bfab22461)

Committed: https://chromium.googlesource.com/chromium/src/+/ab1fa8cfc752cc3f21a6af02b5f5a373f36f02b2

[shrike, 2016-06-20 21:29:15]

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

Review-Url: https://codereview.chromium.org/2073523002
Cr-Commit-Position: refs/heads/master@{#400162}
(cherry picked from commit 29bd2eed90a5c548ce737aa09225952bfab22461)
==========

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

Review-Url: https://codereview.chromium.org/2073523002
Cr-Commit-Position: refs/heads/master@{#400162}
(cherry picked from commit 29bd2eed90a5c548ce737aa09225952bfab22461)

Committed:
https://chromium.googlesource.com/chromium/src/+/ab1fa8cfc752cc3f21a6af02b5f5...
==========

[shrike, 2016-06-20 21:29:17]

Committed patchset #1 (id:1) manually as
ab1fa8cfc752cc3f21a6af02b5f5a373f36f02b2.