Fix math support on wikipedia.

chrome/browser/resources/chromeos/chromevox/common/dom_util.js

Index: chrome/browser/resources/chromeos/chromevox/common/dom_util.js
diff --git a/chrome/browser/resources/chromeos/chromevox/common/dom_util.js b/chrome/browser/resources/chromeos/chromevox/common/dom_util.js
index b9dd523220e50a13d7b59136c8dee310add8ee69..2f59cf49d15f82b5ef6ed86ca93dca400f733063 100644
--- a/chrome/browser/resources/chromeos/chromevox/common/dom_util.js
+++ b/chrome/browser/resources/chromeos/chromevox/common/dom_util.js
@@ -2447,9 +2447,10 @@ cvox.DomUtil.isMathImg = function(node) {
   if (node.tagName != 'IMG') {
     return false;
   }
-  var className = node.className.toLowerCase();
-  return cvox.DomUtil.ALT_MATH_CLASSES.tex.indexOf(className) != -1 ||
-      cvox.DomUtil.ALT_MATH_CLASSES.asciimath.indexOf(className) != -1;
+  return node.className.toLowerCase().split(' ').some(function(className) {

[dmazzoni, 2015/01/14 08:20:34]

Can you use classList.contains? Or at least, iterate over node.classList rather
than splitting on the string.

[David Tseng, 2015/01/14 18:17:35]

No; since the current code lower cases the classname.

 Or at least, iterate over node.classList rather
Done.

+    return cvox.DomUtil.ALT_MATH_CLASSES.tex.indexOf(className) != -1 ||
+        cvox.DomUtil.ALT_MATH_CLASSES.asciimath.indexOf(className) != -1;
+  });
 };