bug symfony#25552 [WebProfilerBundle] Let fetch() cast URL to string (ro0NL)

This PR was merged into the 3.3 branch.

Discussion
----------

[WebProfilerBundle] Let fetch() cast URL to string

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#25538
| License       | MIT
| Doc PR        | symfony/symfony-docs#... <!--highly recommended for new features-->

Taken from the fetch polyfill at https://github.com/github/fetch/blob/master/fetch.js#L325

Commits
-------

1a75e85 [WebProfilerBundle] Let fetch() cast URL to string

Author: fabpot

src/Symfony/Bundle/WebProfilerBundle/Resources/views/Profiler/base_js.html.twig

@@ -250,6 +250,8 @@
                             mode: arguments[0].mode,
                             redirect: arguments[0].redirect
                         };
+                    } else {
+                        url = String(url);
                     }
                     if (!url.match(new RegExp({{ excluded_ajax_paths|json_encode|raw }}))) {
                         var method = 'GET';