Update TestExpectations: gardening.

virtual/threaded/animations/missing-keyframe-properties-repeating.html
virtual/threaded/animations/missing-keyframe-properties-timing-function.html

time out randomly on win debug or linux

BUG=350829
TEST=
TBR=zmo@chromium.org

Review URL: https://codereview.chromium.org/200913003

git-svn-id: svn://svn.chromium.org/blink/trunk@169283 bbb929c8-8fbe-4397-9dbb-9b2b20218538