Revert "Revert "Mark parsing routines with ENABLE(SVG_FONTS)""

This reverts commit ff21ced00528d2d913fbe4374f3c2f5d5b6a4d59.

The original CL was not the reason for failure.

BUG=242735
TBR=tkent, rob.buis@samsung.com, pdr, kouhei

Review URL: https://codereview.chromium.org/539423002

git-svn-id: svn://svn.chromium.org/blink/trunk@181414 bbb929c8-8fbe-4397-9dbb-9b2b20218538