Fix second memory leak in SkSpecialImage

src/core/SkSpecialImage.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file
  */
 #include "SkSpecialImage.h"
 
 #if SK_SUPPORT_GPU
 #include "GrTexture.h"
@@ skipping 484 matching lines @@
             return sk_make_sp<SkImage_Gpu>(fTexture->width(), fTexture->height(),
                                            kNeedNewImageUniqueID,
                                            fAlphaType, fTexture, SkBudgeted::kYes);
         }
 
         GrContext* ctx = fTexture->getContext();
         GrSurfaceDesc desc = fTexture->desc();
         desc.fWidth = subset.width();
         desc.fHeight = subset.height();
 
-        GrTexture* subTx = ctx->textureProvider()->createTexture(desc, SkBudgeted::kYes);
+        SkAutoTUnref<GrTexture> subTx(ctx->textureProvider()->createTexture(desc,
+                                                                            SkBudgeted::kYes));
         if (!subTx) {
             return nullptr;
         }
         ctx->copySurface(subTx, fTexture, subset, SkIPoint::Make(0, 0));
         return sk_make_sp<SkImage_Gpu>(desc.fWidth, desc.fHeight, kNeedNewImageUniqueID,
                                        fAlphaType, subTx, SkBudgeted::kYes);
     }
 
     SkSurface* onMakeTightSurface(const SkImageInfo& info) const override {
         return SkSurface::NewRenderTarget(fTexture->getContext(), SkBudgeted::kYes, info);
@@ skipping 19 matching lines @@
 
 sk_sp<SkSpecialImage> SkSpecialImage::MakeFromGpu(SkImageFilter::Proxy* proxy,
                                                   const SkIRect& subset,
                                                   uint32_t uniqueID,
                                                   GrTexture* tex,
                                                   SkAlphaType at) {
     return nullptr;
 }
 
 #endif