linux: fix a warning in the process_util unittest
linux: fix a warning in the process_util unittest

Review URL: http://codereview.chromium.org/422003

git-svn-id: http://src.chromium.org/svn/trunk/src@32648 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 64af3618120cd2067363b3efad408483e7cf465f
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