virtual/stable/webexposed/element-instance-property-listing.html failing
virtual/stable/webexposed/element-instance-property-listing.html failing

Started after blink r188897, and looks like the test just needs to be
rebaselined. Update TestExpectations.

TBR=ddorwin@chromium.org
NOTRY=true
BUG=451730

Review URL: https://codereview.chromium.org/872603005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@188929 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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