Reland of change all factories to return their base-class

include/effects/SkDiscretePathEffect.h

Index: include/effects/SkDiscretePathEffect.h
diff --git a/include/effects/SkDiscretePathEffect.h b/include/effects/SkDiscretePathEffect.h
index b55dca864440e07e14516172215d3c044ac58a32..a49e2d89a7c7ed60d6735418dff85753cb803bd5 100644
--- a/include/effects/SkDiscretePathEffect.h
+++ b/include/effects/SkDiscretePathEffect.h
@@ -29,9 +29,7 @@
                           they can pass in a different seedAssist to get a
                           different set of path segments.
     */
-    static SkDiscretePathEffect* Create(SkScalar segLength,
-                                        SkScalar deviation,
-                                        uint32_t seedAssist=0) {
+    static SkPathEffect* Create(SkScalar segLength, SkScalar deviation, uint32_t seedAssist = 0) {
         return new SkDiscretePathEffect(segLength, deviation, seedAssist);
     }