Revert of change all factories to return their base-class

include/effects/SkDashPathEffect.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 SkDashPathEffect_DEFINED
 #define SkDashPathEffect_DEFINED
 
@@ skipping 18 matching lines @@
          10 pixels on
          20 pixels off
          10 pixels on
          20 pixels off
          ...
         A phase of -5, 25, 55, 85, etc. would all result in the same path,
          because the sum of all the intervals is 30.
 
         Note: only affects stroked paths.
     */
-    static SkPathEffect* Create(const SkScalar intervals[], int count, SkScalar phase) {
+    static SkDashPathEffect* Create(const SkScalar intervals[], int count,
+                                    SkScalar phase) {
         return new SkDashPathEffect(intervals, count, phase);
     }
     virtual ~SkDashPathEffect();
 
     virtual bool filterPath(SkPath* dst, const SkPath& src,
                             SkStrokeRec*, const SkRect*) const override;
 
     virtual bool asPoints(PointData* results, const SkPath& src,
                           const SkStrokeRec&, const SkMatrix&,
                           const SkRect*) const override;
@@ skipping 17 matching lines @@
     SkScalar    fPhase;
     // computed from phase
     SkScalar    fInitialDashLength;
     int32_t     fInitialDashIndex;
     SkScalar    fIntervalLength;
 
     typedef SkPathEffect INHERITED;
 };
 
 #endif