MAGETWO-57118: [github#6201] Form key shared between admin and frontend

Author: RuslanKostiv1

app/code/Magento/PageCache/etc/frontend/events.xml

@@ -7,7 +7,6 @@
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
     <event name="controller_action_predispatch">
-        <observer name="register_form_key"
-                  instance="Magento\PageCache\Observer\RegisterFormKeyFromCookie" />
+        <observer name="register_form_key" instance="Magento\PageCache\Observer\RegisterFormKeyFromCookie" />
     </event>
 </config>