remove unused SkFixed and SkFract functions

src/utils/SkUnitMappers.cpp

Index: src/utils/SkUnitMappers.cpp
diff --git a/src/utils/SkUnitMappers.cpp b/src/utils/SkUnitMappers.cpp
index 5976e9de52ed5c3c9e1a2bd098932632efc3f583..f86a4542db8cd3957a224d8bb0d374b562c240c2 100644
--- a/src/utils/SkUnitMappers.cpp
+++ b/src/utils/SkUnitMappers.cpp
@@ -8,6 +8,7 @@
 #include "SkUnitMappers.h"
 #include "SkFlattenableBuffers.h"
 
+
 SkDiscreteMapper::SkDiscreteMapper(int segments) {
     if (segments < 2) {
         fSegments = 0;
@@ -17,7 +18,7 @@ SkDiscreteMapper::SkDiscreteMapper(int segments) {
             segments = 0xFFFF;
         }
         fSegments = segments;
-        fScale = SK_Fract1 / (segments - 1);
+        fScale = (1 << 30) / (segments - 1);
     }
 }