Base SkAutoTUnref on skstd::unique_ptr.

src/effects/SkGpuBlurUtils.cpp

Index: src/effects/SkGpuBlurUtils.cpp
diff --git a/src/effects/SkGpuBlurUtils.cpp b/src/effects/SkGpuBlurUtils.cpp
index fd27cc36000f036b0251d07ec04cf6c90384d646..5690c2893f71e0ef4b777802d9d5e5fefb8332b4 100644
--- a/src/effects/SkGpuBlurUtils.cpp
+++ b/src/effects/SkGpuBlurUtils.cpp
@@ -231,7 +231,7 @@ GrTexture* GaussianBlur(GrContext* context,
         dstDrawContext->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint,
                                             SkMatrix::I(), dstRect, srcRect);
 
-        srcDrawContext.swap(&dstDrawContext);
+        srcDrawContext.swap(dstDrawContext);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);
@@ -254,7 +254,7 @@ GrTexture* GaussianBlur(GrContext* context,
         convolve_gaussian_2d(dstDrawContext, dstTexture->asRenderTarget(), clip, srcRect, dstRect,
                              srcTexture, radiusX, radiusY, sigmaX, sigmaY, cropToRect, srcIRect);
 
-        srcDrawContext.swap(&dstDrawContext);
+        srcDrawContext.swap(dstDrawContext);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);
@@ -286,7 +286,7 @@ GrTexture* GaussianBlur(GrContext* context,
                               srcTexture, Gr1DKernelEffect::kX_Direction, radiusX, sigmaX,
                               cropToRect);
 
-            srcDrawContext.swap(&dstDrawContext);
+            srcDrawContext.swap(dstDrawContext);
             srcTexture = dstTexture;
             srcRect = dstRect;
             SkTSwap(dstTexture, tempTexture);
@@ -319,7 +319,7 @@ GrTexture* GaussianBlur(GrContext* context,
                               dstRect, srcTexture, Gr1DKernelEffect::kY_Direction, radiusY, sigmaY,
                               cropToRect);
 
-            srcDrawContext.swap(&dstDrawContext);
+            srcDrawContext.swap(dstDrawContext);
             srcTexture = dstTexture;
             srcRect = dstRect;
             SkTSwap(dstTexture, tempTexture);
@@ -355,7 +355,7 @@ GrTexture* GaussianBlur(GrContext* context,
         dstDrawContext->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint,
                                             SkMatrix::I(), dstRect, srcRect);
 
-        srcDrawContext.swap(&dstDrawContext);
+        srcDrawContext.swap(dstDrawContext);
         srcRect = dstRect;
         srcTexture = dstTexture;
         SkTSwap(dstTexture, tempTexture);