Mojo: NULL -> nullptr in mojo/public/cpp/bindings and also for the bindings generator.

mojo/public/cpp/bindings/lib/validation_errors.cc

Index: mojo/public/cpp/bindings/lib/validation_errors.cc
diff --git a/mojo/public/cpp/bindings/lib/validation_errors.cc b/mojo/public/cpp/bindings/lib/validation_errors.cc
index 61f233f8d32e169eebb407b5103da0ae6fc370cb..47bcf028a93bcad17fe90dafa27da678ff7c6554 100644
--- a/mojo/public/cpp/bindings/lib/validation_errors.cc
+++ b/mojo/public/cpp/bindings/lib/validation_errors.cc
@@ -10,8 +10,9 @@ namespace mojo {
 namespace internal {
 namespace {
 
-ValidationErrorObserverForTesting* g_validation_error_observer = NULL;
-SerializationWarningObserverForTesting* g_serialization_warning_observer = NULL;
+ValidationErrorObserverForTesting* g_validation_error_observer = nullptr;
+SerializationWarningObserverForTesting* g_serialization_warning_observer =
+    nullptr;
 
 }  // namespace
 
@@ -63,7 +64,7 @@ ValidationErrorObserverForTesting::ValidationErrorObserverForTesting()
 
 ValidationErrorObserverForTesting::~ValidationErrorObserverForTesting() {
   MOJO_DCHECK(g_validation_error_observer == this);
-  g_validation_error_observer = NULL;
+  g_validation_error_observer = nullptr;
 }
 
 bool ReportSerializationWarning(ValidationError error) {
@@ -84,7 +85,7 @@ SerializationWarningObserverForTesting::SerializationWarningObserverForTesting()
 SerializationWarningObserverForTesting::
 ~SerializationWarningObserverForTesting() {
   MOJO_DCHECK(g_serialization_warning_observer == this);
-  g_serialization_warning_observer = NULL;
+  g_serialization_warning_observer = nullptr;
 }
 
 }  // namespace internal