Remove a few passing tests from TestExpectations
Remove a few passing tests from TestExpectations

virtual/threaded/transitions/position-background-transition.html
w3c/web-platform-tests/shadow-dom/events/retargeting-focus-events/test-002.html
w3c/web-platform-tests/shadow-dom/shadow-trees/lower-boundary-encapsulation/distribution-001.html
w3c/web-platform-tests/shadow-dom/shadow-trees/lower-boundary-encapsulation/distribution-002.html

BUG=330083/328749
TEST=
TBR=zmo@chromium.org

Review URL: https://codereview.chromium.org/199413018

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@169276 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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