Add new WebKit directory to paths searched by gyp.
Add new WebKit directory to paths searched by gyp.

BUG=none
TEST=none
TBR=dglazkov


git-svn-id: http://src.chromium.org/svn/trunk/src@25622 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 6d59d96cb43fbb5b43b5e0bb516b35d429122f24
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser