Make 'version' text field in About Box selectable.
Make 'version' text field in About Box selectable.

BUG=crbug.com/15642
TEST=select version in about box; copy/paste it somewhere.

Review URL: http://codereview.chromium.org/155361

git-svn-id: http://src.chromium.org/svn/trunk/src@20394 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 8b05bce610da43ded0cd4def176c8aadc0e6d947
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