Sane use of FcPatternGetXXX in SkFontConfigInterface.

This renames get_name to get_string to better reflect what it does, uses
get_int where appropriate, and removes the no longer used code that uses
FcPatternGetBool.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2345053005

Review-Url: https://codereview.chromium.org/2345053005
1 file changed