Fix race in SkTypeface_FreeType::onCountGlyphs.

src/ports/SkFontHost_FreeType_common.h

Index: src/ports/SkFontHost_FreeType_common.h
diff --git a/src/ports/SkFontHost_FreeType_common.h b/src/ports/SkFontHost_FreeType_common.h
index 8c13a80aa57e77a70431b52145af8393c80def8b..6d050cdd9975f030f0e4d2ba3af7419db9f90933 100644
--- a/src/ports/SkFontHost_FreeType_common.h
+++ b/src/ports/SkFontHost_FreeType_common.h
@@ -73,7 +73,6 @@ public:
 protected:
     SkTypeface_FreeType(const SkFontStyle& style, SkFontID uniqueID, bool isFixedPitch)
         : INHERITED(style, uniqueID, isFixedPitch)
-        , fGlyphCount(-1)
     {}
 
     virtual SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
@@ -95,8 +94,6 @@ protected:
                                   size_t length, void* data) const override;
 
 private:
-    mutable int fGlyphCount;
-
     typedef SkTypeface INHERITED;
 };