Fix apps page icon in tabstrip.

Fix apps page icon in tabstrip.

Note that the apps button on the bookmark bar works correctly, but if you
also bookmark the apps page, the bookmark will be theme-colorized
although it probably shouldn't. However, I consider this much more of a
corner case than the described bug (which occurs any time you're using the
app launcher with a themed browser). So for now, just fix the tabstrip
problem.

BUG=628599
Review-Url: https://codereview.chromium.org/2150423002
Cr-Commit-Position: refs/heads/master@{#405827}
(cherry picked from commit 9130993eeff4cc3b23cff8962c78833e8c81456e)

Committed: https://chromium.googlesource.com/chromium/src/+/8efc7a6a5cbca3cdabb1fd374d708b7c60e86ed7

[Evan Stade, 2016-07-18 18:19:49]

Description was changed from

==========
Fix apps page icon in tabstrip.

Note that the apps button on the bookmark bar works correctly, but if you
also bookmark the apps page, the bookmark will be theme-colorized
although it probably shouldn't. However, I consider this much more of a
corner case than the described bug (which occurs any time you're using the
app launcher with a themed browser). So for now, just fix the tabstrip
problem.

BUG=628599

Review-Url: https://codereview.chromium.org/2150423002
Cr-Commit-Position: refs/heads/master@{#405827}
(cherry picked from commit 9130993eeff4cc3b23cff8962c78833e8c81456e)
==========

to

==========
Fix apps page icon in tabstrip.

Note that the apps button on the bookmark bar works correctly, but if you
also bookmark the apps page, the bookmark will be theme-colorized
although it probably shouldn't. However, I consider this much more of a
corner case than the described bug (which occurs any time you're using the
app launcher with a themed browser). So for now, just fix the tabstrip
problem.

BUG=628599

Review-Url: https://codereview.chromium.org/2150423002
Cr-Commit-Position: refs/heads/master@{#405827}
(cherry picked from commit 9130993eeff4cc3b23cff8962c78833e8c81456e)

Committed:
https://chromium.googlesource.com/chromium/src/+/8efc7a6a5cbca3cdabb1fd374d70...
==========

[Evan Stade, 2016-07-18 18:19:50]

Committed patchset #1 (id:1) manually as
8efc7a6a5cbca3cdabb1fd374d708b7c60e86ed7.