dom-ui settings: add settings icon in prep for adopting in settings tab.
dom-ui settings: add settings icon in prep for adopting in settings tab.

BUG=56153
TEST=none
Review URL: http://codereview.chromium.org/3397018

git-svn-id: http://src.chromium.org/svn/trunk/src@60002 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 4d9bde8e8e84bd4596e294e3cc6c59b27e0a829f
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