Simplify _.now and _.isFinite.

lodash.src.js

@@ -765,8 +765,6 @@
         nativeKeys = getNative(Object, 'keys'),
         nativeMax = Math.max,
         nativeMin = Math.min,
-        nativeNow = getNative(Date, 'now'),
-        nativeNumIsFinite = getNative(Number, 'isFinite'),
         nativeParseInt = context.parseInt,
         nativeRandom = Math.random;
 
@@ -7293,9 +7291,9 @@
      * }, _.now());
      * // => logs the number of milliseconds it took for the deferred function to be invoked
      */
-    var now = nativeNow || function() {
+    function now() {
       return new Date().getTime();
-    };
+    }
 
     /*------------------------------------------------------------------------*/
 
@@ -8679,9 +8677,9 @@
      * _.isFinite(Infinity);
      * // => false
      */
-    var isFinite = nativeNumIsFinite || function(value) {
+    function isFinite(value) {
       return typeof value == 'number' && nativeIsFinite(value);
-    };
+    }
 
     /**
      * Checks if `value` is classified as a `Function` object.