Fix About link for RTL

Fix About link for RTL

I realized I used margin-right instead of the direction-neutral
-webkit-margin-end in the M40 fix, so the margin between
the About link and the search box will be too small in RTL.

This fix is already included in the M38 CL.

BUG=421236
R=stevenjb@chromium.org

Committed: https://crrev.com/0ec2d447ad4ce8e14e4ba0f60e40a1f193b6ef98
Cr-Commit-Position: refs/heads/master@{#300517}

[michaelpg, 2014-10-21 01:39:58]

Tiny fix

[stevenjb, 2014-10-21 15:34:25]

lgtm

[michaelpg, 2014-10-21 16:44:40]

The CQ bit was checked by michaelpg@chromium.org

[commit-bot: I haz the power, 2014-10-21 16:46:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/655963005/1

[commit-bot: I haz the power, 2014-10-21 17:49:15]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-21 17:50:59]

Patchset 1 (id:??) landed as
https://crrev.com/0ec2d447ad4ce8e14e4ba0f60e40a1f193b6ef98
Cr-Commit-Position: refs/heads/master@{#300517}