Adding /testing/gmock to .gitignore due to r72866.
Adding /testing/gmock to .gitignore due to r72866.

git-svn-id: http://src.chromium.org/svn/trunk/src@73050 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e78c809013b9a36e5830abe5e623801989a23aab
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