Refactor prettyPrinter to work with immutable objects

[#50766813][#266]

src/core/util.js

@@ -30,5 +30,15 @@ getJasmineRequireObj().util = function() {
     return obj === void 0;
   };
 
+  util.arrayContains = function(array, search) {
+    var i = array.length;
+    while (i--) {
+      if (array[i] == search) {
+        return true;
+      }
+    }
+    return false;
+  }
+
   return util;
 };