Fix getMetadataCookie()

Fix the Fatal error: Call to undefined method Facebook::getMetadataCookie()

application/modules/account/helpers/facebook_helper.php

@@ -1212,6 +1212,38 @@ protected function getCurrentUrl() {
         // rebuild
         return $protocol . $parts['host'] . $port . $parts['path'] . $query;
     }
+
+	  /**
+   * Parses the metadata cookie that our Javascript API set
+   *
+   * @return  an array mapping key to value
+   */
+  protected function getMetadataCookie() {
+    $cookie_name = $this->getMetadataCookieName();
+    if (!array_key_exists($cookie_name, $_COOKIE)) {
+      return array();
+    }
+
+    // The cookie value can be wrapped in "-characters so remove them
+    $cookie_value = trim($_COOKIE[$cookie_name], '"');
+
+    if (empty($cookie_value)) {
+      return array();
+    }
+
+    $parts = explode('&', $cookie_value);
+    $metadata = array();
+    foreach ($parts as $part) {
+      $pair = explode('=', $part, 2);
+      if (!empty($pair[0])) {
+        $metadata[urldecode($pair[0])] =
+          (count($pair) > 1) ? urldecode($pair[1]) : '';
+      }
+    }
+
+    return $metadata;
+  }
+
 
     /**
      * Returns true if and only if the key or key/value pair should
@@ -1437,4 +1469,4 @@ protected function constructSessionVariableName($key) {
         }
         return implode('_', $parts);
     }
-}
+}