Snapshotted plugin label should not be selectable
https://bugs.webkit.org/show_bug.cgi?id=110286

Reviewed by Simon Fraser.

Update the CSS to make it clear that you should click
on a snapshot (use the finger pointer) and disable
text selection.

* css/plugIns.css:
(embed::-webkit-snapshotted-plugin-content .snapshot-container .snapshot-label):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143421 268f45cc-cd09-0410-ab3c-d52691b4dbfc