[Mac] Replace menu_overflow_{up,down}.pdf with PNGs.

[Mac] Replace menu_overflow_{up,down}.pdf with PNGs.

This restores the PNG files that were deleted as unused in
85e1a36049a681b177265763b30a1a843fc3e820, and that were added in
2be293d247224360b64213691aa87da4b4830b7c.

BUG=111101
R=thakis@chromium.org

Committed: https://crrev.com/3a7cb89d023799cf759eb06532589d41ed384f2c
Cr-Commit-Position: refs/heads/master@{#391030}

[Nico, 2016-05-02 18:50:36]

lgtm

nice :-)

[Robert Sesek, 2016-05-02 19:00:51]

The CQ bit was checked by rsesek@chromium.org

[commit-bot: I haz the power, 2016-05-02 19:01:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1936263002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1936263002/20001

[commit-bot: I haz the power, 2016-05-02 19:46:24]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-05-02 19:48:01]

Description was changed from

==========
[Mac] Replace menu_overflow_{up,down}.pdf with PNGs.

This restores the PNG files that were deleted as unused in
85e1a36049a681b177265763b30a1a843fc3e820, and that were added in
2be293d247224360b64213691aa87da4b4830b7c.

BUG=111101
R=thakis@chromium.org
==========

to

==========
[Mac] Replace menu_overflow_{up,down}.pdf with PNGs.

This restores the PNG files that were deleted as unused in
85e1a36049a681b177265763b30a1a843fc3e820, and that were added in
2be293d247224360b64213691aa87da4b4830b7c.

BUG=111101
R=thakis@chromium.org

Committed: https://crrev.com/3a7cb89d023799cf759eb06532589d41ed384f2c
Cr-Commit-Position: refs/heads/master@{#391030}
==========

[commit-bot: I haz the power, 2016-05-02 19:48:02]

Patchset 2 (id:??) landed as
https://crrev.com/3a7cb89d023799cf759eb06532589d41ed384f2c
Cr-Commit-Position: refs/heads/master@{#391030}