Add .DS_Store to the .gitignore file.
Add .DS_Store to the .gitignore file.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2702002

git-svn-id: http://src.chromium.org/svn/trunk/src@49062 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: d5dd0186a973845d932649ed43aad45126e1eaac
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