Attempt to work around missing Array.prototype.find() in Chromium

src/brainbrowser/volume-viewer/volume-loaders/hdf5.js

@@ -48,6 +48,30 @@
     STR: 9
   };
 
+  /* The following polyfill copied verbatim from MDN 2016-06-16 */
+  if (!Array.prototype.find) {
+    Array.prototype.find = function(predicate) {
+      if (this === null) {
+        throw new TypeError('Array.prototype.find called on null or undefined');
+      }
+      if (typeof predicate !== 'function') {
+        throw new TypeError('predicate must be a function');
+      }
+      var list = Object(this);
+      var length = list.length >>> 0;
+      var thisArg = arguments[1];
+      var value;
+
+      for (var i = 0; i < length; i++) {
+        value = list[i];
+        if (predicate.call(thisArg, value, i, list)) {
+          return value;
+        }
+      }
+      return undefined;
+    };
+  }
+
   function defined(x) {
     return typeof x !== 'undefined';
   }