Revert of Provides multiple implementations of Android's SkBitmapRegionDecoder

src/utils/SkBitmapRegionSampler.cpp

-/*
- * 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 "SkBitmapRegionSampler.h"
-
-SkBitmapRegionSampler::SkBitmapRegionSampler(SkImageDecoder* decoder, int width, 
-                                             int height)
-    : INHERITED(width, height)
-    , fDecoder(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* SkBitmapRegionSampler::decodeRegion(int start_x, int start_y,
-                                              int width, int height,
-                                              int sampleSize,
-                                              SkColorType prefColorType) {
-    // Match Android's default settings
-    fDecoder->setDitherImage(true);
-    fDecoder->setPreferQualityOverSpeed(false);
-    fDecoder->setRequireUnpremultipliedColors(false);
-    fDecoder->setSampleSize(sampleSize);
-
-    // kAlpha8 is the legacy representation of kGray8 used by SkImageDecoder
-    if (kGray_8_SkColorType == prefColorType) {
-        prefColorType = kAlpha_8_SkColorType;
-    }
-
-    SkIRect region;
-    region.fLeft = start_x;
-    region.fTop = start_y;
-    region.fRight = start_x + width;
-    region.fBottom = start_y + height;
-
-    SkAutoTDelete<SkBitmap> bitmap(new SkBitmap());
-    if (!fDecoder->decodeSubset(bitmap.get(), region, prefColorType)) {
-        SkDebugf("Error: decodeRegion failed.\n");
-        return nullptr;
-    }
-    return bitmap.detach();
-}