CSS Variables: Fix double include of testharness.js

third_party/WebKit/LayoutTests/fast/css/variables/custom-properties-serialization-quirks-mode.html

-<script src="../../../resources/testharness.js"></script>
+<meta charset="UTF-8">
 <script src="../../../resources/testharness.js"></script>
 <script src="../../../resources/testharnessreport.js"></script>
-<meta charset="UTF-8">
 
 <style>
 #test1 {
   --camelCase: blue;
   color: var(--camelCase);
 }
 #test2 {
   --Aå: 100px;
   width: var(--Aå);
 }
 #test3 {
   --colour: green;
   background: var(--colour);
   color: var(--color);
 }
 </style>
 
 <script>
 test(function() {
-  assert_equals(document.styleSheets[0].cssRules[0].cssText, "#test1 { --camelCase: blue; color: var(--camelCase); }");
-  assert_equals(document.styleSheets[0].cssRules[1].cssText, "#test2 { --Aå: 100px; width: var(--Aå); }");
-  assert_equals(document.styleSheets[0].cssRules[0].style.getPropertyValue("--camelCase"), " blue");
-  assert_equals(document.styleSheets[0].cssRules[0].style.getPropertyValue("color"), "var(--camelCase)");
-  assert_equals(document.styleSheets[0].cssRules[1].style.getPropertyValue("--Aå"), " 100px");
-  assert_equals(document.styleSheets[0].cssRules[1].style.getPropertyValue("width"), "var(--Aå)");
-  assert_equals(document.styleSheets[0].cssRules[2].style.getPropertyValue("background"), "var(--colour)");
-  assert_equals(document.styleSheets[0].cssRules[2].style.getPropertyValue("color"), "var(--color)");
+  var cssRules = document.styleSheets[0].cssRules;
+  assert_equals(cssRules[0].cssText, "#test1 { --camelCase: blue; color: var(--camelCase); }");
+  assert_equals(cssRules[1].cssText, "#test2 { --Aå: 100px; width: var(--Aå); }");
+  assert_equals(cssRules[0].style.getPropertyValue("--camelCase"), " blue");
+  assert_equals(cssRules[0].style.getPropertyValue("color"), "var(--camelCase)");
+  assert_equals(cssRules[1].style.getPropertyValue("--Aå"), " 100px");
+  assert_equals(cssRules[1].style.getPropertyValue("width"), "var(--Aå)");
+  assert_equals(cssRules[2].style.getPropertyValue("background"), "var(--colour)");
+  assert_equals(cssRules[2].style.getPropertyValue("color"), "var(--color)");
 }, "Custom properties serialization");
 </script>