s/geTestSVGTypeface/getTestSVGTypeface

In addition to fixing the typo, this cleans up a few unnecessary calls
into SkTypeface internals.

Change-Id: I101f67053c2db6850d1576de1001998ccf84d2cd
Reviewed-on: https://skia-review.googlesource.com/c/189496
Reviewed-by: Herb Derby <herb@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
1 file changed