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

cc/trees/occlusion_tracker_unittest.cc

Index: cc/trees/occlusion_tracker_unittest.cc
diff --git a/cc/trees/occlusion_tracker_unittest.cc b/cc/trees/occlusion_tracker_unittest.cc
index 6ab339723adb9a177d585f93f9f623d40f771c36..b8ccd112548fa0a222572b354b5e09e3cc0e67e2 100644
--- a/cc/trees/occlusion_tracker_unittest.cc
+++ b/cc/trees/occlusion_tracker_unittest.cc
@@ -124,11 +124,11 @@ struct OcclusionTrackerTestMainThreadTypes {
   template <typename T>
   static LayerPtrType PassLayerPtr(T* layer) {
     LayerPtrType ref(*layer);
-    *layer = NULL;
+    *layer = nullptr;
     return ref;
   }
 
-  static void DestroyLayer(LayerPtrType* layer) { *layer = NULL; }
+  static void DestroyLayer(LayerPtrType* layer) { *layer = nullptr; }
 
   static void RecursiveUpdateNumChildren(LayerType* layerType) {}
 };