Use SkSafeRef when claiming a ref on the SkImageFilter at the WebKit API boundary.

webkit/compositor_bindings/web_layer_impl.cc

Index: webkit/compositor_bindings/web_layer_impl.cc
diff --git a/webkit/compositor_bindings/web_layer_impl.cc b/webkit/compositor_bindings/web_layer_impl.cc
index 8683d1f73e299c3b7d122ab0afe851249830b9f2..5986774f5590e686f60f16e2b06b797caa203ead 100644
--- a/webkit/compositor_bindings/web_layer_impl.cc
+++ b/webkit/compositor_bindings/web_layer_impl.cc
@@ -241,7 +241,7 @@ void WebLayerImpl::setBackgroundFilters(const WebFilterOperations& filters)
 
 void WebLayerImpl::setFilter(SkImageFilter* filter)
 {
-    filter->ref(); // Claim a reference for the compositor.
+    SkSafeRef(filter); // Claim a reference for the compositor.
     m_layer->setFilter(skia::AdoptRef(filter));
 }