Add a comment explaining how to create keys for component extensions, since people hit this all the time.
Add a comment explaining how to create keys for component
extensions, since people hit this all the time.

TBR=mpcomplete@chromium.org

git-svn-id: http://src.chromium.org/svn/trunk/src@73408 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c567b7e9a0cc877a0b1caa3b04a74b6dadef6260
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