Remove SkLerpXfermode

gm/lerpmode.cpp

-/*
- * 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 "gm.h"
-#include "SkCanvas.h"
-#include "SkLerpXfermode.h"
-
-static void show_circlelayers(SkCanvas* canvas, SkXfermode* mode) {
-    SkPaint paint;
-    paint.setAntiAlias(true);
-    SkRect r, bounds = { 10, 10, 110, 110 };
-
-    r = bounds;
-    r.fRight = bounds.centerX();
-    canvas->drawRect(r, paint);
-
-    canvas->saveLayer(&bounds, nullptr);
-
-    paint.setColor(0x80FF0000);
-    r = bounds;
-    r.inset(20, 0);
-    canvas->drawOval(r, paint);
-
-    paint.setColor(0x800000FF);
-    r = bounds;
-    r.inset(0, 20);
-    paint.setXfermode(mode);
-    canvas->drawOval(r, paint);
-
-    canvas->restore();
-}
-
-DEF_SIMPLE_GM(lerpmode, canvas, 240, 120) {
-        show_circlelayers(canvas, nullptr);
-        canvas->translate(150, 0);
-        SkAutoTUnref<SkXfermode> mode(SkLerpXfermode::Create(0.5f));
-        show_circlelayers(canvas, mode.get());
-}