Switch to putting appversion at top level of XML
Switch to putting appversion at top level of XML

This change puts appversion at the same level as buildtime, and
so it is avalable (now) for use in histogram versioning, as well
as stability versioning (or user metrics versioning).

r=huanr
Review URL: http://codereview.chromium.org/646056

git-svn-id: http://src.chromium.org/svn/trunk/src@39421 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 2fa3ba04a40838ee0a9b87c1d61a9c8f29444b42
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