8325189: Enable this-escape javac warning in java.base

Reviewed-by: alanb, erikj, naoto, smarks, ihse, joehw, lancea, weijun

src/java.base/share/classes/java/util/zip/ZipFile.java

@@ -227,6 +227,7 @@ public class ZipFile implements ZipConstants, Closeable {
      *
      * @since 1.7
      */
+    @SuppressWarnings("this-escape")
     public ZipFile(File file, int mode, Charset charset) throws IOException
     {
         if (((mode & OPEN_READ) == 0) ||