Remove unused baseForIn.

lodash.js

@@ -2665,10 +2665,9 @@
     }
 
     /**
-     * The base implementation of `baseForIn` and `baseForOwn` which iterates
+     * The base implementation of `baseForOwn` which iterates over `object`
-     * over `object` properties returned by `keysFunc` invoking `iteratee` for
+     * properties returned by `keysFunc` invoking `iteratee` for each property.
-     * each property. Iteratee functions may exit iteration early by explicitly
+     * Iteratee functions may exit iteration early by explicitly returning `false`.
-     * returning `false`.
      *
      * @private
      * @param {Object} object The object to iterate over.
@@ -2690,18 +2689,6 @@
      */
     var baseForRight = createBaseFor(true);
 
-    /**
-     * The base implementation of `_.forIn` without support for iteratee shorthands.
-     *
-     * @private
-     * @param {Object} object The object to iterate over.
-     * @param {Function} iteratee The function invoked per iteration.
-     * @returns {Object} Returns `object`.
-     */
-    function baseForIn(object, iteratee) {
-      return object == null ? object : baseFor(object, iteratee, keysIn);
-    }
-
     /**
      * The base implementation of `_.forOwn` without support for iteratee shorthands.
      *
@@ -4177,7 +4164,7 @@
     }
 
     /**
-     * Creates a base function for methods like `_.forIn`.
+     * Creates a base function for methods like `_.forIn` and `_.forOwn`.
      *
      * @private
      * @param {boolean} [fromRight] Specify iterating from right to left.