Auto merge of #22415 - servo-wpt-sync:wpt_update_10-12-2018, r=jdm

Sync WPT with upstream (10-12-2018)

Automated downstream sync of changes from upstream as of 10-12-2018.
[no-wpt-sync]

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tests/wpt/metadata/FileAPI/url/url-with-fetch.any.js.ini

@@ -37,3 +37,6 @@
   [Revoke blob URL after creating Request, will fetch]
     expected: FAIL
 
+  [Revoke blob URL after calling fetch, fetch should succeed]
+    expected: FAIL
+