Issue 3515 - Adapted polyfill for URL class for consistency

lib/polyfill/url.js

Index: lib/polyfill/url.js
===================================================================
new file mode 100644
--- /dev/null
+++ b/lib/polyfill/url.js
@@ -0,0 +1,53 @@
+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2015 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+function(global)
+{
+  // Chrome <35 and Safari 6 used the non-standard name webkitURL
+  if (!("URL" in global) && "webkitURL" in global)
+    global.URL = global.webkitURL;
+
+  // Chrome <32 didn't implement any of those properties
+  var URLProperties = ["href", "protocol", "host", "hostname", "pathname", "search"];
+  if ("URL" in global)
+  {
+    var dummy = new URL("about:blank");
+    if (URLProperties.every(function(prop) { return prop in dummy; }))
+      return;
+  }
+
+  var doc = document.implementation.createHTMLDocument();
+  var base = doc.createElement("base");
+  doc.head.appendChild(base);
+  var anchor = doc.createElement("a");
+  doc.body.appendChild(anchor);
+
+  global.URL = function(url, baseUrl)
+  {
+    if (baseUrl instanceof URL)
+      base.href = baseUrl.href;
+    else
+      base.href = baseUrl || "";
+    anchor.href = url;
+
+    for (var i = 0; i < URLProperties.length; i++)
+    {
+      var prop = URLProperties[i];
+      this[prop] = anchor[prop];
+    }
+  };
+}(this);