Mojo: NULL -> nullptr in mojo/public/cpp outside of bindings.

mojo/public/cpp/application/lazy_interface_ptr.h

Index: mojo/public/cpp/application/lazy_interface_ptr.h
diff --git a/mojo/public/cpp/application/lazy_interface_ptr.h b/mojo/public/cpp/application/lazy_interface_ptr.h
index 908ea0854b83ea12541fbfc9b37983f9bb1b6bb9..1f4b9733a1fb47a9180a6e5b09c10b71413941d7 100644
--- a/mojo/public/cpp/application/lazy_interface_ptr.h
+++ b/mojo/public/cpp/application/lazy_interface_ptr.h
@@ -5,8 +5,6 @@
 #ifndef MOJO_PUBLIC_CPP_APPLICATION_LAZY_INTERFACE_PTR_H_
 #define MOJO_PUBLIC_CPP_APPLICATION_LAZY_INTERFACE_PTR_H_
 
-#include <string>
-
 #include "mojo/public/cpp/application/connect.h"
 #include "mojo/public/interfaces/application/service_provider.mojom.h"
 
@@ -15,7 +13,7 @@ namespace mojo {
 template<typename Interface>
 class LazyInterfacePtr : public InterfacePtr<Interface> {
  public:
-  LazyInterfacePtr() : service_provider_(NULL) {}
+  LazyInterfacePtr() : service_provider_(nullptr) {}
 
   LazyInterfacePtr(ServiceProvider* service_provider)
       : service_provider_(service_provider) {