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This resource file affects many tests, most of which have changes to
their expectations files simply removing the console warning about the
usage of Shadow DOM v0.

Other small related changes in this patchset:
 - fast/dom/shadow/drag-and-drop-in-shadow.html had one instance of a
   'content' element replaced with 'slot'.
 - Many tests in virtual/web-components-v0-disabled virtual suite have
   their expectations change to "working" because the corresponding
   non-virtual suite test no longer uses web components v0. Several
   still fail, just differently now.
 - Five tests in web-components-v0-only/shadow-dom-v0 were modified
   to point to the web-components-v0-only local copy of shadow-dom.js,
   instead of referring outside the web-components-v0-only tree.
 - One more V0-only test (events-stopped-at-shadow-boundary.html) was
   moved into the web-components-v0-only folder.

Bug: 937746
Change-Id: I741223e1bea30e77c0d269262d0fe394b2524040
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208102
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Stephen Chenney <schenney@chromium.org>
Reviewed-by: Stephen Chenney <schenney@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774306}