Switch new SkImageFilter internal methods over to sk_sp

src/gpu/GrLayerHoister.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrLayerCache.h"
 #include "GrLayerHoister.h"
 #include "GrRecordReplaceDraw.h"
@@ skipping 291 matching lines @@
 
     SkImageFilter::DeviceProxy proxy(device);
 
     // TODO: should the layer hoister store stand alone layers as SkSpecialImages internally?
     const SkIRect subset = SkIRect::MakeWH(layer->texture()->width(), layer->texture()->height());
     sk_sp<SkSpecialImage> img(SkSpecialImage::MakeFromGpu(&proxy, subset,
                                                           kNeedNewImageUniqueID_SpecialImage,
                                                           layer->texture()));
 
     SkIPoint offset = SkIPoint::Make(0, 0);
-    SkAutoTUnref<SkSpecialImage> result(layer->filter()->filterImage(img.get(),
-                                                                     filterContext,
-                                                                     &offset));
+    sk_sp<SkSpecialImage> result(layer->filter()->filterImage(img.get(),
+                                                              filterContext,
+                                                              &offset));
     if (!result) {
         // Filtering failed. Press on with the unfiltered version.
         return;
     }
 
     SkASSERT(result->peekTexture());
     layer->setTexture(result->peekTexture(), result->subset(), false);
     layer->setOffset(offset);
 }
 
@@ skipping 63 matching lines @@
 #if !GR_CACHE_HOISTED_LAYERS
 
     // This code completely clears out the atlas. It is required when
     // caching is disabled so the atlas doesn't fill up and force more
     // free floating layers
     layerCache->purgeAll();
 #endif
 
     layerCache->end();
 }