Should not override styleResolverUpdateType to Reset when some existing stylesheet still has @font-face rule.

BUG=305885, 309370
TEST=fast/css/font-face-html-as-svg.html (Mac)

Review URL: https://codereview.chromium.org/82643002

git-svn-id: svn://svn.chromium.org/blink/trunk@162527 bbb929c8-8fbe-4397-9dbb-9b2b20218538