remove supports4f flag for colorfilters

include/core/SkColorFilter.h

Index: include/core/SkColorFilter.h
diff --git a/include/core/SkColorFilter.h b/include/core/SkColorFilter.h
index ea893e056f5150cc242e3929523274776a129f42..4c9795c2711037b646ef876edc01beb0c8cdb037 100644
--- a/include/core/SkColorFilter.h
+++ b/include/core/SkColorFilter.h
@@ -73,17 +73,12 @@ public:
         /** If set the filter methods will not change the alpha channel of the colors.
         */
         kAlphaUnchanged_Flag = 1 << 0,
-        kSupports4f_Flag     = 1 << 1,
     };
 
     /** Returns the flags for this filter. Override in subclasses to return custom flags.
     */
     virtual uint32_t getFlags() const { return 0; }
 
-    bool supports4f() const {
-        return SkToBool(this->getFlags() & kSupports4f_Flag);
-    }
-
     /**
      *  If this subclass can optimally createa composition with the inner filter, return it as
      *  a new filter (which the caller must unref() when it is done). If no such optimization