Revert of Provides multiple implementations of Android's SkBitmapRegionDecoder

src/utils/SkBitmapRegionCanvas.h

-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "SkBitmap.h"
-#include "SkBitmapRegionDecoderInterface.h"
-#include "SkScanlineDecoder.h"
-
-/*
- * This class implements SkBitmapRegionDecoder using an SkScanlineDecoder and
- * an SkCanvas.  It uses the scanline decoder to subset the height.  It then
- * will subset the width and scale by drawing to an SkCanvas.
- */
-// FIXME (msarett): This implementation does not support WEBP, because WEBP
-// does not have a scanline decoder.
-class SkBitmapRegionCanvas : public SkBitmapRegionDecoderInterface {
-public:
-
-    /*
-     * Takes ownership of pointer to decoder
-     */
-    SkBitmapRegionCanvas(SkScanlineDecoder* decoder);
-
-    /*
-     * Three differences from the Android version:
-     *     Returns a Skia bitmap instead of an Android bitmap.
-     *     Android version attempts to reuse a recycled bitmap.
-     *     Removed the options object and used parameters for color type and
-     *     sample size.
-     */
-    SkBitmap* decodeRegion(int start_x, int start_y, int width, int height,
-                           int sampleSize, SkColorType prefColorType) override;
-
-private:
-
-    SkAutoTDelete<SkScanlineDecoder> fDecoder;
-
-    typedef SkBitmapRegionDecoderInterface INHERITED;
-
-};