Throw exception on null pointers in raw toNative

Source/bindings/dart/custom/DartNodeCustom.cpp

Index: Source/bindings/dart/custom/DartNodeCustom.cpp
diff --git a/Source/bindings/dart/custom/DartNodeCustom.cpp b/Source/bindings/dart/custom/DartNodeCustom.cpp
index f1f6d4cb3ec0421f1666fe4397da83bd338ae14d..ef513444ec788401e9305beed6e98eb4def80e48 100644
--- a/Source/bindings/dart/custom/DartNodeCustom.cpp
+++ b/Source/bindings/dart/custom/DartNodeCustom.cpp
@@ -54,11 +54,11 @@ void insertBeforeCallback(Dart_NativeArguments args)
     {
         Node* receiver = DartDOMWrapper::receiver<Node>(args);
 
-        Node* newChild = DartNode::toNative(args, 1, exception);
+        Node* newChild = DartNode::toNativeWithNullCheck(args, 1, exception);
         if (exception)
             goto fail;
 
-        Node* refChild = DartNode::toNative(args, 2, exception);
+        Node* refChild = DartNode::toNativeWithNullCheck(args, 2, exception);
         if (exception)
             goto fail;
 
@@ -87,11 +87,11 @@ void replaceChildCallback(Dart_NativeArguments args)
     {
         Node* receiver = DartDOMWrapper::receiver<Node>(args);
 
-        Node* newChild = DartNode::toNative(args, 1, exception);
+        Node* newChild = DartNode::toNativeWithNullCheck(args, 1, exception);
         if (exception)
             goto fail;
 
-        Node* oldChild = DartNode::toNative(args, 2, exception);
+        Node* oldChild = DartNode::toNativeWithNullCheck(args, 2, exception);
         if (exception)
             goto fail;
 
@@ -120,7 +120,7 @@ void removeChildCallback(Dart_NativeArguments args)
     {
         Node* receiver = DartDOMWrapper::receiver<Node>(args);
 
-        Node* child = DartNode::toNative(args, 1, exception);
+        Node* child = DartNode::toNativeWithNullCheck(args, 1, exception);
         if (exception)
             goto fail;
 
@@ -149,7 +149,7 @@ void appendChildCallback(Dart_NativeArguments args)
     {
         Node* receiver = DartDOMWrapper::receiver<Node>(args);
 
-        Node* child = DartNode::toNative(args, 1, exception);
+        Node* child = DartNode::toNativeWithNullCheck(args, 1, exception);
         if (exception)
             goto fail;