Remove old create etag function

lib/connector/sabre/file.php

@@ -101,15 +101,6 @@ class OC_Connector_Sabre_File extends OC_Connector_Sabre_Node implements Sabre_D
 		return $this->getETagPropertyForPath($this->path);
 	}
 
-	/**
-	 * Creates a ETag for this path.
-	 * @param string $path Path of the file
-	 * @return string|null Returns null if the ETag can not effectively be determined
-	 */
-	static protected function createETag($path) {
-		return \OC\Files\Filesystem::hash('md5', $path);
-	}
-
 	/**
 	 * Returns the mime-type for a file
 	 *