Revert of experiment: float color components

include/core/SkColorFilter.h

Index: include/core/SkColorFilter.h
diff --git a/include/core/SkColorFilter.h b/include/core/SkColorFilter.h
index 211aae696269447ba22a8446e61f9f1baaa97846..c5d084a22d0d31cc44faf4fd9e79118ee6ea0c3e 100644
--- a/include/core/SkColorFilter.h
+++ b/include/core/SkColorFilter.h
@@ -68,13 +68,10 @@
     */
     virtual void filterSpan(const SkPMColor src[], int count, SkPMColor result[]) const = 0;
 
-    virtual void filterSpan4f(const SkPM4f src[], int count, SkPM4f result[]) const;
-
     enum Flags {
         /** If set the filter methods will not change the alpha channel of the colors.
         */
-        kAlphaUnchanged_Flag = 1 << 0,
-        kSupports4f_Flag     = 1 << 1,
+        kAlphaUnchanged_Flag = 0x01,
     };
 
     /** Returns the flags for this filter. Override in subclasses to return custom flags.