Revert of change all factories to return their base-class

include/effects/SkCornerPathEffect.h

Index: include/effects/SkCornerPathEffect.h
diff --git a/include/effects/SkCornerPathEffect.h b/include/effects/SkCornerPathEffect.h
index 13095f0e6c4a46cb46d6db731a2707f967576d0d..4c8908575db241f581e3c9f6e5fd857f69f7cdfb 100644
--- a/include/effects/SkCornerPathEffect.h
+++ b/include/effects/SkCornerPathEffect.h
@@ -20,7 +20,8 @@
     /** radius must be > 0 to have an effect. It specifies the distance from each corner
         that should be "rounded".
     */
-    static SkPathEffect* Create(SkScalar radius) { return new SkCornerPathEffect(radius); }
+    static SkCornerPathEffect* Create(SkScalar radius) { return new SkCornerPathEffect(radius); }
+    virtual ~SkCornerPathEffect();
 
     virtual bool filterPath(SkPath* dst, const SkPath& src,
                             SkStrokeRec*, const SkRect*) const override;
@@ -33,8 +34,6 @@
 #endif
 
 protected:
-    virtual ~SkCornerPathEffect();
-
     explicit SkCornerPathEffect(SkScalar radius);
     void flatten(SkWriteBuffer&) const override;