Brian Osman 257dc7b1e1 Change to new SkFontMgr API (flutter/engine#4173)
* Change to new SkFontMgr API

These changes clarify ownership rules and work today. They will be
necessary once SK_SUPPORT_LEGACY_FONTMGR_API goes away.

* Fix spacing

* Formatting
2017-10-04 14:22:57 -04:00
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