[ios Mojo] Added util function to convert WKSecurityOrigin to GURL.

ios/web/public/origin_util.cc

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ios/web/public/origin_util.h"
-
-#include "net/base/url_util.h"
-#include "url/gurl.h"
-
-namespace web {
-
-bool IsOriginSecure(const GURL& url) {
-  if (url.SchemeIsCryptographic() || url.SchemeIsFile())
-    return true;
-
-  if (url.SchemeIsFileSystem() && url.inner_url() &&
-      IsOriginSecure(*url.inner_url())) {
-    return true;
-  }
-
-  std::string hostname = url.HostNoBrackets();
-  if (net::IsLocalhost(hostname))
-    return true;
-
-  return false;
-}
-
-}  // namespace web