Treat JS TypeError as Dart NSM

pkg/dev_compiler/tool/input_sdk/private/js_helper.dart

Index: pkg/dev_compiler/tool/input_sdk/private/js_helper.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/js_helper.dart b/pkg/dev_compiler/tool/input_sdk/private/js_helper.dart
index 0017ebc9b16877df510e6ab71c831789f1b79945..8d960821848766431dad86d3aa34467b98ad930c 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/js_helper.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/js_helper.dart
@@ -576,16 +576,16 @@ throwConcurrentModificationError(collection) {
   throw new ConcurrentModificationError(collection);
 }
 
-class NullError extends Error implements NoSuchMethodError {
-  final String _message;
-  final String _method;
-
-  NullError(this._message, match)
-      : _method = match == null ? null : JS('', '#.method', match);
+@JsPeerInterface(name: 'TypeError')
+class NullError extends Interceptor implements NoSuchMethodError {
+  StackTrace get stackTrace => Primitives.extractStackTrace(this);
 
   String toString() {
-    if (_method == null) return 'NullError: $_message';
-    return "NullError: method not found: '$_method' on null";
+    // TODO(vsm): Distinguish between null reference errors and other
+    // TypeErrors.  We should not get non-null TypeErrors from DDC code,
+    // but we may from native JavaScript.
+    var message = JS('String', '#.message', this);
+    return "NullError: $message";
   }
 }