Remove !typeFace early return in fontFamilyName
Remove !typeFace early return in fontFamilyName

This early return was protecting against SVG Font usage, however SVG
Fonts were removed in https://codereview.chromium.org/656913006, so
convert into an ASSERT instead and remove the outdated comment.

Review URL: https://codereview.chromium.org/684463004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@184804 bbb929c8-8fbe-4397-9dbb-9b2b20218538

primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs,primiano/blink-gitcs