Make version number in about box selectable again so that it can be copied.
Make version number in about box selectable again so that it can be copied.

BUG=23990
TEST=Selectable version number in about box
Review URL: http://codereview.chromium.org/269005

git-svn-id: http://src.chromium.org/svn/trunk/src@28273 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 5f538553b2fe4b60b75efd709dcd0d72b265c5ca
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