Auto merge of #21415 - servo-wpt-sync:wpt_update_14-08-2018, r=jdm

Sync WPT with upstream (14-08-2018)

Automated downstream sync of changes from upstream as of 14-08-2018.
[no-wpt-sync]

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tests/wpt/metadata/FileAPI/url/url-in-tags-revoke.window.js.ini

@@ -1,4 +1,5 @@
 [url-in-tags-revoke.window.html]
+  expected: TIMEOUT
   [Fetching a blob URL immediately before revoking it works in an iframe.]
     expected: FAIL
 
@@ -14,3 +15,6 @@
   [Opening a blob URL in a new window by clicking an <a> tag works immediately before revoking the URL.]
     expected: FAIL
 
+  [Fetching a blob URL immediately before revoking it works in <script> tags.]
+    expected: TIMEOUT
+