MC-15763: Introduce critical CSS scope loaded through head

- Stabilization

Author: vzabaznov

lib/internal/Magento/Framework/View/Layout/etc/head.xsd

@@ -67,7 +67,7 @@
             <xs:element name="script" type="scriptType" minOccurs="0" maxOccurs="unbounded"/>
             <xs:element name="remove" type="srcRemoveType" minOccurs="0" maxOccurs="unbounded"/>
             <xs:element name="attribute" type="headAttributeType" minOccurs="0" maxOccurs="unbounded"/>
-            <xs:element name="font" type="linkType" minOccurs="0" maxOccurs="unbounded"/>app/code/Magento/Theme/Block/Html/Header/CriticalCss.php
+            <xs:element name="font" type="linkType" minOccurs="0" maxOccurs="unbounded"/>
         </xs:sequence>
     </xs:complexType>
 </xs:schema>