Fixes #1036 - double deepClone declaration.

Author: jakubpawlowicz

lib/optimizer/level-2/properties/override-properties.js

@@ -8,7 +8,6 @@ var sameVendorPrefixesIn = require('./vendor-prefixes').same;
 
 var compactable = require('../compactable');
 var deepClone = require('../clone').deep;
-var deepClone = require('../clone').deep;
 var restoreWithComponents = require('../restore-with-components');
 var shallowClone = require('../clone').shallow;