Remove invalid test two-properties-in-keyframed-animation

This test is no longer valid, since filter and transform are both
accelerated.

R=vollick@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/26696002

git-svn-id: svn://svn.chromium.org/blink/trunk@159233 bbb929c8-8fbe-4397-9dbb-9b2b20218538