Bug 1600709 [wpt PR 20565] - Allow document access iframe attribute.,…

… a=testonly

Automatic update from web-platform-tests
Allow document access iframe attribute.

Remove document-access feature policy.

Change feature policy to an iframe attribute since feature policies
inherit and it really doesn't give us the characteristics we wish for.

Explainer: https://github.com/dtapuska/documentaccess

BUG=961448

Change-Id: Iee24cbd3dff53bd94153104bce250e3f9a947639
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1926788
Reviewed-by: Ken Buchanan <kenrbchromium.org>
Reviewed-by: Kentaro Hara <harakenchromium.org>
Commit-Queue: Dave Tapuska <dtapuskachromium.org>
Cr-Commit-Position: refs/heads/master{#721227}

--

wpt-commits: c9ca9882fa8f8ca4bf6a877667940cd511a46608
wpt-pr: 20565

UltraBlame original commit: 4bb333cfef76349385b3c7460b30624055205271

testing/web-platform/tests/html/browsers/windows/document-access/document_access_parent_access.tentative.html

@@ -38,16 +38,7 @@
 >
 <
 iframe
-allow
-=
-"
-document
--
-access
-'
-none
-'
-"
+disallowdocumentaccess
 src
 =
 "