Remove ref counting from GrOp.

Instead use std::unique_ptr to manage GrOp lifetime.

Change-Id: Ic1dc1e0ffd7254c3994221f498677af5bbf66a71
Reviewed-on: https://skia-review.googlesource.com/6479
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/instanced/GLInstancedRendering.cpp b/src/gpu/instanced/GLInstancedRendering.cpp
index da764b2..0d2a2dd 100644
--- a/src/gpu/instanced/GLInstancedRendering.cpp
+++ b/src/gpu/instanced/GLInstancedRendering.cpp
@@ -60,7 +60,9 @@
     return static_cast<GrGLGpu*>(this->gpu());
 }
 
-sk_sp<InstancedRendering::Op> GLInstancedRendering::makeOp() { return sk_sp<Op>(new GLOp(this)); }
+std::unique_ptr<InstancedRendering::Op> GLInstancedRendering::makeOp() {
+    return std::unique_ptr<Op>(new GLOp(this));
+}
 
 void GLInstancedRendering::onBeginFlush(GrResourceProvider* rp) {
     // Count what there is to draw.