Fix url-format.any.js test expectations.

It never failed, so [ Pass Failure ] didn't make sense. It does however
timeout regularly, so reduce the url_count it uses to check if blob URLs
are more or less unique by half.

And since sandboxed-iframe.html includes url-format.any.js, also turn
that test back on, since I'm pretty sure its failures were the same
timeout.

Bug: 800898, 801078
Change-Id: I90ae00190282ee8915867535dbb39aa171950245
Reviewed-on: https://chromium-review.googlesource.com/861948
Reviewed-by: Joshua Bell <[email protected]>
Commit-Queue: Joshua Bell <[email protected]>
Cr-Commit-Position: refs/heads/master@{#528802}

FileAPI/url/url-format.any.js

@@ -2,7 +2,7 @@ const blob = new Blob(['test']);
 const file = new File(['test'], 'name');
 
 test(() => {
-  const url_count = 10000;
+  const url_count = 5000;
   let list = [];
 
   for (let i = 0; i < url_count; ++i)