Revert of expand unitests for color4f

include/core/SkColorFilter.h

Index: include/core/SkColorFilter.h
diff --git a/include/core/SkColorFilter.h b/include/core/SkColorFilter.h
index aece22e05a594bb5785f07a092529c077465bfe2..211aae696269447ba22a8446e61f9f1baaa97846 100644
--- a/include/core/SkColorFilter.h
+++ b/include/core/SkColorFilter.h
@@ -81,10 +81,6 @@
     */
     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