Revert of change all factories to return their base-class

include/effects/SkDiscretePathEffect.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkDiscretePathEffect_DEFINED
 #define SkDiscretePathEffect_DEFINED
 
@@ skipping 11 matching lines @@
 
         @param seedAssist This is a caller-supplied seedAssist that modifies
                           the seed value that is used to randomize the path
                           segments' endpoints. If not supplied it defaults to 0,
                           in which case filtering a path multiple times will
                           result in the same set of segments (this is useful for
                           testing). If a caller does not want this behaviour
                           they can pass in a different seedAssist to get a
                           different set of path segments.
     */
-    static SkPathEffect* Create(SkScalar segLength, SkScalar deviation, uint32_t seedAssist = 0) {
+    static SkDiscretePathEffect* Create(SkScalar segLength,
+                                        SkScalar deviation,
+                                        uint32_t seedAssist=0) {
         return new SkDiscretePathEffect(segLength, deviation, seedAssist);
     }
 
     virtual bool filterPath(SkPath* dst, const SkPath& src,
                             SkStrokeRec*, const SkRect*) const override;
 
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDiscretePathEffect)
 
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
     bool exposedInAndroidJavaAPI() const override { return true; }
 #endif
 
 protected:
     SkDiscretePathEffect(SkScalar segLength,
                          SkScalar deviation,
                          uint32_t seedAssist);
     void flatten(SkWriteBuffer&) const override;
 
 private:
     SkScalar fSegLength, fPerterb;
 
     /* Caller-supplied 32 bit seed assist */
     uint32_t fSeedAssist;
 
     typedef SkPathEffect INHERITED;
 };
 
 #endif