Fixing gyp mistake that causes warnings but unfortunately not errors at the
moment.

Introduced in:
r78711 | rsesek@chromium.org 

BUG=None
TEST=None


R=rsesek@chromium.org,ben@chromium.org,sky@chromium.org
TBR=rsesek@chromium.org
Review URL: http://codereview.chromium.org/6685110

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@78841 0039d316-1c4b-4281-b951-d872f2087c98