Make GrResourceProvider more sk_spified

Change-Id: If191553093031705756358f4551a5b1e96439742
Reviewed-on: https://skia-review.googlesource.com/60000
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/ops/GrRegionOp.cpp b/src/gpu/ops/GrRegionOp.cpp
index 177a185..1bfed80 100644
--- a/src/gpu/ops/GrRegionOp.cpp
+++ b/src/gpu/ops/GrRegionOp.cpp
@@ -123,7 +123,7 @@
             return;
         }
         size_t vertexStride = gp->getVertexStride();
-        sk_sp<const GrBuffer> indexBuffer(target->resourceProvider()->refQuadIndexBuffer());
+        sk_sp<const GrBuffer> indexBuffer = target->resourceProvider()->refQuadIndexBuffer();
         PatternHelper helper(GrPrimitiveType::kTriangles);
         void* vertices =
                 helper.init(target, vertexStride, indexBuffer.get(), kVertsPerInstance,