Delete dead BitmapRegionDecoder code in tools

tools/SkBitmapRegionDecoder.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.
  */
 
 #ifndef SkBitmapRegionDecoder_DEFINED
 #define SkBitmapRegionDecoder_DEFINED
 
 #include "SkBitmap.h"
 #include "SkEncodedFormat.h"
 #include "SkStream.h"
 
 /*
  * This class aims to provide an interface to test multiple implementations of
  * SkBitmapRegionDecoder.
  */
 class SkBitmapRegionDecoder {
 public:
 
     enum Strategy {
         kCanvas_Strategy,       // Draw to the canvas, uses SkCodec
-        kOriginal_Strategy,     // Sampling, uses SkImageDecoder
         kAndroidCodec_Strategy, // Uses SkAndroidCodec for scaling and subsetting
     };
 
     /*
      * @param data     Refs the data while this object exists, unrefs on destruction
      * @param strategy Strategy used for scaling and subsetting
      * @return         Tries to create an SkBitmapRegionDecoder, returns NULL on failure
      */
     static SkBitmapRegionDecoder* Create(
             SkData* data, Strategy strategy);
@@ skipping 46 matching lines @@
         : fWidth(width)
         , fHeight(height)
     {}
 
 private:
     const int fWidth;
     const int fHeight;
 };
 
 #endif