Convert GrBuffer owners to sk_sp

Change-Id: Id49d775c30f01f4de05f385227c5ed5d90d6839e
Reviewed-on: https://skia-review.googlesource.com/c/187920
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/ops/GrAAConvexPathRenderer.cpp b/src/gpu/ops/GrAAConvexPathRenderer.cpp
index 8d7316e..39a8d5f 100644
--- a/src/gpu/ops/GrAAConvexPathRenderer.cpp
+++ b/src/gpu/ops/GrAAConvexPathRenderer.cpp
@@ -761,7 +761,7 @@
                 continue;
             }
 
-            const GrBuffer* vertexBuffer;
+            sk_sp<const GrBuffer> vertexBuffer;
             int firstVertex;
 
             GrVertexWriter verts{target->makeVertexSpace(kVertexStride, vertexCount,
@@ -772,7 +772,7 @@
                 return;
             }
 
-            const GrBuffer* indexBuffer;
+            sk_sp<const GrBuffer> indexBuffer;
             int firstIndex;
 
             uint16_t *idxs = target->makeIndexSpace(indexCount, &indexBuffer, &firstIndex);