Replacing NULL with nullptr

components/copresence/handlers/audio/audio_directive_list.cc

Index: components/copresence/handlers/audio/audio_directive_list.cc
diff --git a/components/copresence/handlers/audio/audio_directive_list.cc b/components/copresence/handlers/audio/audio_directive_list.cc
index 2060ef51048316ebcf4fa41a773c87b88096c702..5434c60b4ea0185df238cda87d4bc94cfdc15e0a 100644
--- a/components/copresence/handlers/audio/audio_directive_list.cc
+++ b/components/copresence/handlers/audio/audio_directive_list.cc
@@ -72,7 +72,7 @@ scoped_ptr<AudioDirective> AudioDirectiveList::GetActiveDirective() {
   }
 
   if (active_directives_.empty())
-    return make_scoped_ptr<AudioDirective>(NULL);
+    return scoped_ptr<AudioDirective>().Pass();
 
   return make_scoped_ptr(new AudioDirective(active_directives_.front()));
 }