LeakExpectations: Remove SVG font leak expectations

SVG font implementation is removed from Blink. Remove LeakExpectations
entries for SVG font tests as they don't leak Documents anymore.

BUG=366455,242735
TBR=pdr

Review URL: https://codereview.chromium.org/673093002

git-svn-id: svn://svn.chromium.org/blink/trunk@184326 bbb929c8-8fbe-4397-9dbb-9b2b20218538