Restore toolkit/obsolete files and reinstate them to toolkit/content

toolkit/content/globalOverlay.xul

@@ -0,0 +1,38 @@
+<?xml version="1.0"?> 
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+
+<overlay id="globalOverlay"
+		 xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+  <script type="application/javascript" src="chrome://global/content/globalOverlay.js"/>
+  <script type="application/javascript"><![CDATA[
+
+    function FillInTooltip ( tipElement )
+    {
+      var retVal = false;
+      var textNode = document.getElementById("TOOLTIP-tooltipText");
+      if (textNode) {
+        while (textNode.hasChildNodes())
+          textNode.removeChild(textNode.firstChild);
+        var tipText = tipElement.getAttribute("tooltiptext");
+        if (tipText) {
+          var node = document.createTextNode(tipText);
+          textNode.appendChild(node);
+          retVal = true;
+        }
+      }
+      return retVal;
+    }
+
+  ]]></script>
+
+  <popupset id="aTooltipSet">
+    <tooltip id="aTooltip" class="tooltip" onpopupshowing="return FillInTooltip(document.tooltipNode);">
+      <label id="TOOLTIP-tooltipText" class="tooltip-label" flex="1"/>
+    </tooltip>
+  </popupset>
+
+</overlay>