Linux theme: make dragging the tabbar drag the window when the tabbar is unified with the titlebar. (Bug 635397) r=dao a2.0=beltzner

browser/themes/gnomestripe/browser/browser.css

@@ -1391,6 +1391,10 @@ richlistitem[type~="action"][actiontype="switchtab"] > .ac-url-box > .ac-action-
   color: -moz-menubartext;
 }
 
+#TabsToolbar[tabsontop=true]:not(:-moz-lwtheme):-moz-system-metric(menubar-drag) {
+  -moz-binding: url("chrome://global/content/bindings/toolbar.xml#toolbar-drag");
+}
+
 #TabsToolbar[tabsontop=false] {
   background-image:
     -moz-linear-gradient(bottom, rgba(0,0,0,.3) 1px, rgba(0,0,0,.05) 1px, transparent 50%);