Make <custom-ident> not insert quotes

third_party/WebKit/LayoutTests/animations/svg-presentation-attribute-animation.html

 <script src="../resources/testharness.js"></script>
 <script src="../resources/testharnessreport.js"></script>
 
 <svg>
   <rect id="target"/>
 </svg>
 
 <script>
 'use strict';
 
 var testCases = [
   ['alignment-baseline', 'middle'],
   ['baseline-shift', '100px'],
   ['buffered-rendering', 'dynamic'],
   ['clip-path', 'url("#test")'],
   ['clip-rule', 'evenodd'],
   ['color', 'rgb(1, 2, 3)'],
   ['color-interpolation', 'linearRGB'],
   ['color-interpolation-filters', 'sRGB'],
   ['color-rendering', 'optimizeSpeed'],
   ['cursor', 'url("test://uri/"), auto'],
   ['dominant-baseline', 'middle'],
   ['fill', 'rgb(1, 2, 3)'],
   ['fill-opacity', '0.25'],
   ['fill-rule', 'evenodd'],
   ['filter', 'url("#test")'],
   ['flood-color', 'rgb(1, 2, 3)'],
   ['flood-opacity', '0.25'],
-  ['font-family', "'Test Font'"],
+  ['font-family', "\"Test Font\""],
   ['font-size', '123px'],
   ['font-stretch', 'condensed'],
   ['font-style', 'italic'],
   ['font-variant', 'small-caps'],
   ['font-weight', '900'],
   ['image-rendering', 'pixelated'],
   ['letter-spacing', '123px'],
   ['lighting-color', 'rgb(1, 2, 3)'],
   ['marker-end', 'url("#test")'],
   ['marker-mid', 'url("#test")'],
@@ skipping 37 matching lines @@
 for (var [property, value] of testCases) {
   target.animate({[svgPrefix(property)]: value}, {fill: 'forwards'});
 }
 
 for (var [property, value] of testCases) {
   test(() => {
     assert_equals(getComputedStyle(target)[property], value);
   }, 'Web Animations can target ' + svgPrefix(property));
 }
 </script>