Remove checkGlobal helper.

lodash.js

@@ -361,10 +361,10 @@
       freeParseInt = parseInt;
 
   /** Detect free variable `global` from Node.js. */
-  var freeGlobal = checkGlobal(typeof global == 'object' && global);
+  var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
 
   /** Detect free variable `self`. */
-  var freeSelf = checkGlobal(typeof self == 'object' && self);
+  var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
 
   /** Used as a reference to the global object. */
   var root = freeGlobal || freeSelf || Function('return this')();
@@ -1014,17 +1014,6 @@
     return index;
   }
 
-  /**
-   * Checks if `value` is a global object.
-   *
-   * @private
-   * @param {*} value The value to check.
-   * @returns {null|Object} Returns `value` if it's a global object, else `null`.
-   */
-  function checkGlobal(value) {
-    return (value && value.Object === Object) ? value : null;
-  }
-
   /**
    * Gets the number of `placeholder` occurrences in `array`.
    *