Update Mac SVG TestExepectations

Remove NeedsRebaseline lines that are no longer needed.

TBR=ojan@chromium.org
BUG=

Review URL: https://codereview.chromium.org/108603003

git-svn-id: svn://svn.chromium.org/blink/trunk@163388 bbb929c8-8fbe-4397-9dbb-9b2b20218538