Declate Plugin for WebApi cache and remove not used methods

Author: nuzil

app/code/Magento/Webapi/Model/ServiceMetadata.php

@@ -287,17 +287,6 @@ public function getRoutesConfig()
         return $this->routes;
     }
 
-    /**
-     * Set Routes Config Cache ID
-     *
-     * @param string $routesConfigCacheId
-     */
-    public function setRoutesConfigCacheId($routesConfigCacheId){
-
-        $this->routesConfigCacheId = $routesConfigCacheId;
-
-    }
-
     /**
      * Collect the list of services with routes and request types for use in REST.
      *

app/code/Magento/WebapiAsync/etc/di.xml

@@ -10,6 +10,9 @@
     <type name="Magento\Webapi\Model\ServiceMetadata">
         <plugin name="webapiServiceMetadataAsync" type="Magento\WebapiAsync\Plugin\ServiceMetadata" />
     </type>
+    <type name="Magento\Webapi\Model\Cache\Type\Webapi">
+        <plugin name="webapiCacheAsync" type="Magento\WebapiAsync\Plugin\Cache\Webapi" />
+    </type>
     <virtualType name="Magento\WebapiAsync\Model\VirtualType\Rest\Config" type="Magento\Webapi\Model\Rest\Config">
         <arguments>
             <argument name="config" xsi:type="object">Magento\WebapiAsync\Model\BulkServiceConfig</argument>