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

cc/trees/occlusion_tracker.cc

Index: cc/trees/occlusion_tracker.cc
diff --git a/cc/trees/occlusion_tracker.cc b/cc/trees/occlusion_tracker.cc
index 7d90834b35f6d05030a3b8a2c529bdf8dabd7c0a..727181ebb5e096b5336625f27f4ae652a516a9ba 100644
--- a/cc/trees/occlusion_tracker.cc
+++ b/cc/trees/occlusion_tracker.cc
@@ -21,8 +21,9 @@ template <typename LayerType>
 OcclusionTracker<LayerType>::OcclusionTracker(
     const gfx::Rect& screen_space_clip_rect)
     : screen_space_clip_rect_(screen_space_clip_rect),
-      occluding_screen_space_rects_(NULL),
-      non_occluding_screen_space_rects_(NULL) {}
+      occluding_screen_space_rects_(nullptr),
+      non_occluding_screen_space_rects_(nullptr) {
+}
 
 template <typename LayerType>
 OcclusionTracker<LayerType>::~OcclusionTracker() {}
@@ -155,9 +156,9 @@ void OcclusionTracker<LayerType>::EnterRenderTarget(
   if (!stack_.empty() && stack_.back().target == new_target)
     return;
 
-  const LayerType* old_target = NULL;
+  const LayerType* old_target = nullptr;
   const typename LayerType::RenderSurfaceType* old_occlusion_immune_ancestor =
-      NULL;
+      nullptr;
   if (!stack_.empty()) {
     old_target = stack_.back().target;
     old_occlusion_immune_ancestor =
@@ -188,7 +189,7 @@ void OcclusionTracker<LayerType>::EnterRenderTarget(
             &inverse_new_target_screen_space_transform);
   }
 
-  bool entering_root_target = new_target->parent() == NULL;
+  bool entering_root_target = new_target->parent() == nullptr;
 
   bool copy_outside_occlusion_forward =
       stack_.size() > 1 &&