Updated test expectations: further failure in animation tests.

virtual/threaded/transitions/transition-end-event-container.html
virtual/threaded/transitions/transition-end-event-attributes.html

now fail on additional platforms.

BUG=248938
TBR=ajuma@chromium.org

Review URL: https://codereview.chromium.org/23367008

git-svn-id: svn://svn.chromium.org/blink/trunk@156658 bbb929c8-8fbe-4397-9dbb-9b2b20218538