Simplify URL API initialization.

Only Chromium versions between M8 and M10 used window.createObjectURL and are not in use anymore.
Opera 12 is also not in use anymore and makes the check for URL.revokeObjectURL obsolete.

Author: blueimp

js/load-image.js

@@ -9,7 +9,7 @@
  * https://opensource.org/licenses/MIT
  */
 
-/* global define, module, Promise, webkitURL */
+/* global define, module, Promise */
 
 ;(function ($) {
   'use strict'
@@ -112,12 +112,8 @@
     }
     return executor(callback, callback)
   }
-  // The check for URL.revokeObjectURL fixes an issue with Opera 12,
-  // which provides URL.createObjectURL but doesn't properly implement it:
-  var urlAPI =
-    ($.createObjectURL && $) ||
-    ($.URL && URL.revokeObjectURL && URL) ||
-    ($.webkitURL && webkitURL)
+
+  var urlAPI = $.URL || $.webkitURL
 
   /**
    * Helper function to revoke an object URL