WebUI: Fix/suppress some existing violations of no-restricted-globals.

ui/webui/resources/js/util.js

Index: ui/webui/resources/js/util.js
diff --git a/ui/webui/resources/js/util.js b/ui/webui/resources/js/util.js
index 28a60d2ce1378e6c9609170c4aad62c3d547c856..599dc033b1c8532514791f46ef70b6525aa6b9ff 100644
--- a/ui/webui/resources/js/util.js
+++ b/ui/webui/resources/js/util.js
@@ -10,6 +10,9 @@
  * @return {HTMLElement} The found element or null if not found.
  */
 function $(id) {
+  // Disable getElementById restriction here, since we are instructing other
+  // places to re-use the $() that is defined here.
+  // eslint-disable-next-line no-restricted-properties
   var el = document.getElementById(id);
   return el ? assertInstanceof(el, HTMLElement) : null;
 }
@@ -22,7 +25,7 @@ function $(id) {
  * @return {Element} The found element or null if not found.
  */
 function getSVGElement(id) {
-  var el = document.getElementById(id);
+  var el = $(id);

[dpapad, 2017/06/06 19:25:51]

Well, that was the culprit for the failing tests. Justified, since getSVGElement
can't delegate to $(), because the latter asserts for HTMLELement, which SVG
elements do not inherit from.

   return el ? assertInstanceof(el, Element) : null;
 }