Fix missing favicon for chrome://extensions/
Fix missing favicon for chrome://extensions/

It was mistakenly removed in r40468.

BUG=None
TEST=None
TBR=aa@chromium.org

Review URL: http://codereview.chromium.org/669261

git-svn-id: http://src.chromium.org/svn/trunk/src@40881 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 24f206f7ad8085278f8db14c92773f99abe00df0
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