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

Source/devtools/front_end/utilities.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 269 matching lines @@
                     return chunkb.length - chunka.length;
             }
         } else if (chunka !== chunkb)
             return (chunka < chunkb) ? -1 : 1;
         a = a.substring(chunka.length);
         b = b.substring(chunkb.length);
     }
 }
 
 /**
+ * @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
  * @return {number}
  */
 Number.constrain = function(num, min, max)
 {
     if (num < min)
         num = min;
     else if (num > max)
@@ skipping 1194 matching lines @@
     {
         console.assert(this._pendingIncomingCallbacksCount > 0);
         if (userCallback) {
             var args = Array.prototype.slice.call(arguments, 1);
             userCallback.apply(null, args);
         }
         if (!--this._pendingIncomingCallbacksCount && this._outgoingCallback)
             this._outgoingCallback();
     }
 }