GTK: Set WMCLASS in a way docks notice while still solving display issues on XFCE.

BUG=20587
TEST=Check xprop on the main window.

Review URL: http://codereview.chromium.org/6879127

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@82581 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed