[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr [part-…

cc/trees/tree_synchronizer.cc

Index: cc/trees/tree_synchronizer.cc
diff --git a/cc/trees/tree_synchronizer.cc b/cc/trees/tree_synchronizer.cc
index d17f0175b9d9cbd10491b57ba632814760366246..b11dd4ee5413bb46560168d3db26e6bfb789d7aa 100644
--- a/cc/trees/tree_synchronizer.cc
+++ b/cc/trees/tree_synchronizer.cc
@@ -163,7 +163,7 @@ void UpdateScrollbarLayerPointersRecursiveInternal(
   ScrollbarLayerImplBase* scrollbar_layer_impl =
       iter != new_layers->end()
           ? static_cast<ScrollbarLayerImplBase*>(iter->second)
-          : NULL;
+          : nullptr;
   DCHECK(scrollbar_layer_impl);
 
   scrollbar_layer->PushScrollClipPropertiesTo(scrollbar_layer_impl);