Fix unused variable on GCC.
Fix unused variable on GCC.

TBR=wtc
http://crbug.com/18697

Review URL: http://codereview.chromium.org/164410

git-svn-id: http://src.chromium.org/svn/trunk/src@23194 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e0dc8156047892b07ce41f5a80c97803ad4b1657
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