remove SkStippleMaskFilter - no external clients

include/effects/SkStippleMaskFilter.h

-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkStippleMaskFilter_DEFINED
-#define SkStippleMaskFilter_DEFINED
-
-#include "SkMaskFilter.h"
-
-/**
- * Simple MaskFilter that creates a screen door stipple pattern.
- */
-class SK_API SkStippleMaskFilter : public SkMaskFilter {
-public:
-    static SkStippleMaskFilter* Create() {
-        return SkNEW(SkStippleMaskFilter);
-    }
-
-    virtual bool filterMask(SkMask* dst, const SkMask& src,
-                            const SkMatrix& matrix,
-                            SkIPoint* margin) const SK_OVERRIDE;
-
-    // getFormat is from SkMaskFilter
-    virtual SkMask::Format getFormat() const SK_OVERRIDE {
-        return SkMask::kA8_Format;
-    }
-
-    SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkStippleMaskFilter);
-
-protected:
-    SkStippleMaskFilter() : INHERITED() {
-    }
-    explicit SkStippleMaskFilter(SkReadBuffer& buffer)
-        : SkMaskFilter(buffer) {
-    }
-
-private:
-    typedef SkMaskFilter INHERITED;
-};
-
-#endif // SkStippleMaskFilter_DEFINED