Revert of factories should return baseclass, allowing the impl to specialize

include/effects/SkDropShadowImageFilter.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkColor.h"
 #include "SkImageFilter.h"
 #include "SkScalar.h"
 
 class SK_API SkDropShadowImageFilter : public SkImageFilter {
 public:
     enum ShadowMode {
         kDrawShadowAndForeground_ShadowMode,
         kDrawShadowOnly_ShadowMode,
 
         kLast_ShadowMode = kDrawShadowOnly_ShadowMode
     };
 
     static const int kShadowModeCount = kLast_ShadowMode+1;
 
-    static SkImageFilter* Create(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY,
-                                 SkColor color, ShadowMode shadowMode, SkImageFilter* input = NULL,
-                                 const CropRect* cropRect = NULL) {
+    static SkDropShadowImageFilter* Create(SkScalar dx, SkScalar dy,
+                                           SkScalar sigmaX, SkScalar sigmaY, SkColor color,
+                                           ShadowMode shadowMode,
+                                           SkImageFilter* input = NULL,
+                                           const CropRect* cropRect = NULL) {
         return new SkDropShadowImageFilter(dx, dy, sigmaX, sigmaY, color, shadowMode, input,
                                            cropRect);
     }
 
     void computeFastBounds(const SkRect&, SkRect*) const override;
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDropShadowImageFilter)
 
 protected:
+    SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,
+                            ShadowMode shadowMode, SkImageFilter* input, const CropRect* cropRect);
     void flatten(SkWriteBuffer&) const override;
-    bool onFilterImage(Proxy*, const SkBitmap& source, const Context&, SkBitmap* result,
-                       SkIPoint* loc) const override;
-    bool onFilterBounds(const SkIRect& src, const SkMatrix&, SkIRect* dst) const override;
+    bool onFilterImage(Proxy*, const SkBitmap& source, const Context&, SkBitmap* result, SkIPoint* loc) const override;
+    virtual bool onFilterBounds(const SkIRect& src, const SkMatrix&,
+                                SkIRect* dst) const override;
 
 private:
-    SkDropShadowImageFilter(SkScalar dx, SkScalar dy, SkScalar sigmaX, SkScalar sigmaY, SkColor,
-                            ShadowMode shadowMode, SkImageFilter* input, const CropRect* cropRect);
-
     SkScalar fDx, fDy, fSigmaX, fSigmaY;
     SkColor fColor;
     ShadowMode fShadowMode;
-
     typedef SkImageFilter INHERITED;
 };