Fixup animated svg tests after r174060

These tests don't have reliable repaint rects because their svg starts
animating from the beginning of the test.  In these cases, these tests
should just rely on pixel output for verifying pixel correctness.

NOTRY=true
BUG=369609

Review URL: https://codereview.chromium.org/289873005

git-svn-id: svn://svn.chromium.org/blink/trunk@174211 bbb929c8-8fbe-4397-9dbb-9b2b20218538