Fix build/mac/tweak_app_infoplist build script for git users.  Patch by Robert Sesek <rsesek@gmail.com>.
Fix build/mac/tweak_app_infoplist build script for git users.  Patch by Robert
Sesek <rsesek@gmail.com>.

Review URL: http://codereview.chromium.org/165314

git-svn-id: http://src.chromium.org/svn/trunk/src@23075 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 7ed93f831447e0d972d48215707945e944fd143c
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