remove code from SK_SUPPORT_LEGACY_NEWFROMGENERATOR, eliminates caller of deprecated SkInstallDisca…

src/image/SkImage_Generator.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 "SkImage_Base.h"
 #include "SkBitmap.h"
 #include "SkData.h"
@@ skipping 66 matching lines @@
 }
 
 bool SkImage_Generator::getROPixels(SkBitmap* bitmap) const {
     return fCache->lockAsBitmap(bitmap);
 }
 
 GrTexture* SkImage_Generator::asTextureRef(GrContext* ctx, SkImageUsageType usage) const {
     return fCache->lockAsTexture(ctx, usage);
 }
 
-#ifndef SK_SUPPORT_LEGACY_NEWFROMGENERATOR
 SkImage* SkImage::NewFromGenerator(SkImageGenerator* generator, const SkIRect* subset) {
     SkImageCacherator* cache = SkImageCacherator::NewFromGenerator(generator, subset);
     if (!cache) {
         return nullptr;
     }
     return SkNEW_ARGS(SkImage_Generator, (cache));
 }
-#endif