Gtk: don't crash when a dragged tab gets deleted.
Gtk: don't crash when a dragged tab gets deleted.

Unfortunately, the more correct seeming gtk_grab_remove(gtk_grab_get_current()); doesn't seem to work.

BUG=30592
TEST=see bug

Review URL: http://codereview.chromium.org/542139

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@36598 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser