Remove internal calls to SkImage::getTexture

src/core/SkPictureImageGenerator.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 "SkImageGenerator.h"
 #include "SkCanvas.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkPicture.h"
 #include "SkSurface.h"
 #include "SkTLazy.h"
 
 class SkPictureImageGenerator : SkImageGenerator {
 public:
@@ skipping 129 matching lines @@
     SkMatrix matrix = fMatrix;
     if (subset) {
         matrix.postTranslate(-subset->x(), -subset->y());
     }
     surface->getCanvas()->clear(0); // does NewRenderTarget promise to do this for us?
     surface->getCanvas()->drawPicture(fPicture, &matrix, fPaint.getMaybeNull());
     SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
     if (!image.get()) {
         return nullptr;
     }
-    return SkSafeRef(image->getTexture());
+    return SkSafeRef(as_IB(image)->peekTexture());
 }
 #endif