[rAc OSX] Fix reversed use of top and bottom padding.

[rAc OSX] Fix reversed use of top and bottom padding.

The coordinate system for the window controller is flipped, but the code was
treating it as though it was unflipped.

BUG=315977
TEST=slightly less padding at top of dialog
R=groby@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=235682

[groby-ooo-7-16, 2013-11-14 19:21:03]

lgtm

[commit-bot: I haz the power, 2013-11-14 23:52:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/isherman@chromium.org/72513003/1

[commit-bot: I haz the power, 2013-11-15 02:33:12]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/isherman@chromium.org/72513003/1

[commit-bot: I haz the power, 2013-11-15 04:26:01]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/isherman@chromium.org/72513003/1

[commit-bot: I haz the power, 2013-11-15 07:57:52]

Retried try job too often on linux_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_rel&...

[commit-bot: I haz the power, 2013-11-15 22:57:28]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/isherman@chromium.org/72513003/1

[commit-bot: I haz the power, 2013-11-16 01:17:05]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/isherman@chromium.org/72513003/1

[commit-bot: I haz the power, 2013-11-18 09:33:35]

Change committed as 235682