Replace SkTypeface::Style with SkFontStyle.

expectations/gm/Test-ChromeOS-Alex-GMA3150-x86-Debug/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 3284 matching lines @@
           "bitmap-64bitMD5", 
           46200135541452310
         ]
       ], 
       "reviewed-by-human": false
     }, 
     "fontmgr_iter_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          3107305384935863757
+          18133751285868944069
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "fontmgr_iter_8888.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          12311346928809779354
+          7429794481924593524
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "fontmgr_match_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           6338121414979628929
         ]
@@ skipping 3750 matching lines @@
           2149562185397201955
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }