DevTools: Fix console.log for arrays in some corner cases.

Source/devtools/front_end/utilities.js

Index: Source/devtools/front_end/utilities.js
diff --git a/Source/devtools/front_end/utilities.js b/Source/devtools/front_end/utilities.js
index a416b6bf793f5026f7819ecbef31ff7976a59971..5fb73ce42fe9345fc30e427623dad7065d58f3d9 100644
--- a/Source/devtools/front_end/utilities.js
+++ b/Source/devtools/front_end/utilities.js
@@ -287,6 +287,18 @@ String.naturalOrderComparator = function(a, b)
 }
 
 /**
+ * @param {string} name
+ * @param {number=} arrayLength
+ * @return {boolean}
+ */
+String.isArrayIndexPropertyName = function(name, arrayLength)
+{
+    // Array index check according to the ES5-15.4.
+    var index = name >>> 0;
+    return String(index) === name && index !== 0xffffffff && (typeof arrayLength === "undefined" || index < arrayLength);
+}
+
+/**
  * @param {number} num
  * @param {number} min
  * @param {number} max