NULL -> nullptr under athena/

athena/content/web_contents_view_delegate_factory_impl.cc

Index: athena/content/web_contents_view_delegate_factory_impl.cc
diff --git a/athena/content/web_contents_view_delegate_factory_impl.cc b/athena/content/web_contents_view_delegate_factory_impl.cc
index 4aa304e3264b6925f6f871aa2450408e0b63f9e5..410a39e356f6c51165fe6096a029d52ccda46726 100644
--- a/athena/content/web_contents_view_delegate_factory_impl.cc
+++ b/athena/content/web_contents_view_delegate_factory_impl.cc
@@ -29,7 +29,7 @@ class WebContentsViewDelegateImpl : public content::WebContentsViewDelegate {
   virtual content::WebDragDestDelegate* GetDragDestDelegate() override {
     // TODO(oshima): crbug.com/401610
     NOTIMPLEMENTED();
-    return NULL;
+    return nullptr;
   }
 
   virtual bool Focus() override {
@@ -128,7 +128,7 @@ class WebContentsViewDelegateImpl : public content::WebContentsViewDelegate {
 
   views::FocusManager* GetFocusManager() {
     views::Widget* toplevel_widget = GetTopLevelWidget();
-    return toplevel_widget ? toplevel_widget->GetFocusManager() : NULL;
+    return toplevel_widget ? toplevel_widget->GetFocusManager() : nullptr;
   }
 
   void SetInitialFocus() {