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

include/effects/SkOffsetImageFilter.h

Index: include/effects/SkOffsetImageFilter.h
diff --git a/include/effects/SkOffsetImageFilter.h b/include/effects/SkOffsetImageFilter.h
index 40f2ce337470ef438edb5d1addb0c2268b85c1b7..30e380d89b03bb00dc68787530da5f817b936109 100644
--- a/include/effects/SkOffsetImageFilter.h
+++ b/include/effects/SkOffsetImageFilter.h
@@ -12,32 +12,30 @@
 #include "SkPoint.h"
 
 class SK_API SkOffsetImageFilter : public SkImageFilter {
+    typedef SkImageFilter INHERITED;
+
 public:
-    static SkImageFilter* Create(SkScalar dx, SkScalar dy, SkImageFilter* input = NULL,
-                                 const CropRect* cropRect = NULL) {
+    static SkOffsetImageFilter* Create(SkScalar dx, SkScalar dy, SkImageFilter* input = NULL,
+                                       const CropRect* cropRect = NULL) {
         if (!SkScalarIsFinite(dx) || !SkScalarIsFinite(dy)) {
             return NULL;
         }
         return new SkOffsetImageFilter(dx, dy, input, cropRect);
     }
-
     void computeFastBounds(const SkRect& src, SkRect* dst) const override;
-
     SK_TO_STRING_OVERRIDE()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkOffsetImageFilter)
 
 protected:
+    SkOffsetImageFilter(SkScalar dx, SkScalar dy, SkImageFilter* input, const CropRect* cropRect);
     void flatten(SkWriteBuffer&) const override;
-    bool onFilterImage(Proxy*, const SkBitmap& src, const Context&, SkBitmap* result,
-                       SkIPoint* loc) const override;
+
+    virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
+                               SkBitmap* result, SkIPoint* loc) const override;
     bool onFilterBounds(const SkIRect&, const SkMatrix&, SkIRect*) const override;
 
 private:
-    SkOffsetImageFilter(SkScalar dx, SkScalar dy, SkImageFilter* input, const CropRect*);
-
     SkVector fOffset;
-
-    typedef SkImageFilter INHERITED;
 };
 
 #endif