Linux: fix build with system ICU.

Linux: fix build with system ICU.

This is upstreaming Gentoo Linux patch,
fixing breakage from https://chromiumcodereview.appspot.com/10941025/

TBR=vitalybuka,abodenha

BUG=none
TEST=none

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=159235

[commit-bot: I haz the power, 2012-09-28 08:09:44]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/phajdan.jr@chromium.org/10986080/1

[commit-bot: I haz the power, 2012-09-28 10:27:11]

Change committed as 159235

[Paweł Hajdan Jr., 2012-09-28 13:52:13]

TBR

Please note how to properly include ICU headers.

[Albert Bodenhamer, 2012-09-28 16:37:03]

lgtm

[Vitaly Buka (NO REVIEWS), 2012-09-28 17:40:45]

lgtm