Fix build with system harfbuzz

Fix build with system harfbuzz

This is upstreaming Gentoo Linux patch

BUG=none
R=thestig@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275094

[Lei Zhang, 2014-06-04 17:45:07]

lgtm

[commit-bot: I haz the power, 2014-06-04 17:46:27]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/phajdan.jr@chromium.org/312143002/1

[commit-bot: I haz the power, 2014-06-04 21:20:28]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  android_chromium_gn_compile_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_chromium_gn_c...)
  linux_chromium_gn_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_gn_rel...)
  win_chromium_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/win_chromium_rel/buil...)

[commit-bot: I haz the power, 2014-06-04 21:28:26]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-04 21:28:26]

Try jobs failed on following builders:
  linux_chromium_gn_rel on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_gn_rel...)

[Paweł Hajdan Jr., 2014-06-05 14:25:19]

Committed patchset #1 manually as r275094 (presubmit successful).