Bug 788914 - Remove enablePrivilege from bug 585922 tests. r=mrbkap

This test chokes on the changes in the patch for some reason. Fortunately, since
enablePrivilege now exists solely to make our tests go green, changing its semantics
and removing use of it from anywhere that goes orange is a perfectly acceptable
approach. ;-)

layout/base/tests/bug585922-ref.html

@@ -7,13 +7,10 @@
     <input type=text>
     <script>
       function doTest() {
-        netscape.security.PrivilegeManager.enablePrivilege(
-          "UniversalXPConnect");
-
         var d = document.querySelector("input");
         d.value = "b";
         d.focus();
-        var editor = d.QueryInterface(Components.interfaces.nsIDOMNSEditableElement).editor;
+        var editor = SpecialPowers.wrap(d).QueryInterface(Components.interfaces.nsIDOMNSEditableElement).editor;
         var sel = editor.selection;
         var t = editor.rootElement.firstChild;
         sel.collapse(t, 1); // put the caret at the end of the textbox

layout/base/tests/bug585922.html

@@ -7,8 +7,6 @@
     <input type=text>
     <script>
       function doTest() {
-        netscape.security.PrivilegeManager.enablePrivilege(
-          "UniversalXPConnect");
         function enableCaret(aEnable) {
           var selCon = editor.selectionController;
           selCon.setCaretEnabled(aEnable);
@@ -17,13 +15,11 @@
         var d = document.querySelector("input");
         d.value = "a";
         d.focus();
-        var editor = d.QueryInterface(Components.interfaces.nsIDOMNSEditableElement).editor;
+        var editor = SpecialPowers.wrap(d).QueryInterface(Components.interfaces.nsIDOMNSEditableElement).editor;
         var sel = editor.selection;
         var t = editor.rootElement.firstChild;
         sel.collapse(t, 1); // put the caret at the end of the div
         setTimeout(function() {
-          netscape.security.PrivilegeManager.enablePrivilege(
-            "UniversalXPConnect");
           enableCaret(false);enableCaret(true);// force a caret display
           enableCaret(false); // hide the caret
           t.replaceData(0, 1, "b"); // replace the text node data