remove avoid and pixelxor xfermodes

include/client/android/SkPixelXorXfermode.h

-/*
- * Copyright 2007 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 SkPixelXorXfermode_DEFINED
-#define SkPixelXorXfermode_DEFINED
-
-#include "SkXfermode.h"
-
-/** SkPixelXorXfermode implements a simple pixel xor (op ^ src ^ dst).
-    This transformation does not follow premultiplied conventions, therefore
-    this proc *always* returns an opaque color (alpha == 255). Thus it is
-    not really usefull for operating on blended colors.
-*/
-class SK_API SkPixelXorXfermode : public SkXfermode {
-public:
-    static sk_sp<SkXfermode> Make(SkColor opColor) {
-        return sk_sp<SkXfermode>(new SkPixelXorXfermode(opColor));
-    }
-#ifdef SK_SUPPORT_LEGACY_XFERMODE_PTR
-    static SkXfermode* Create(SkColor opColor) {
-        return Make(opColor).release();
-    }
-#endif
-
-#if SK_SUPPORT_GPU
-    const GrFragmentProcessor* getFragmentProcessorForImageFilter(
-                                                    const GrFragmentProcessor* dst) const override;
-    GrXPFactory* asXPFactory() const override;
-#endif
-
-    SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPixelXorXfermode)
-
-protected:
-    void flatten(SkWriteBuffer&) const override;
-    SkPMColor xferColor(SkPMColor src, SkPMColor dst) const override;
-
-private:
-    explicit SkPixelXorXfermode(SkColor opColor) {
-        fOpColor = SkPreMultiplyColor(opColor | 0xFF000000);
-    }
-
-    SkPMColor fOpColor;
-
-    typedef SkXfermode INHERITED;
-};
-
-#endif