Migration of testing scripts in tools/ to libv2

tools/testing/dart/status_expression.dart

Index: tools/testing/dart/status_expression.dart
diff --git a/tools/testing/dart/status_expression.dart b/tools/testing/dart/status_expression.dart
index a5e919a41b75a7088caaf2f9a5a0060d35d1894c..2ac072a0534198dd5b3e83dce711ed697b0881a2 100644
--- a/tools/testing/dart/status_expression.dart
+++ b/tools/testing/dart/status_expression.dart
@@ -175,14 +175,14 @@ class Scanner {
   String current;
 
   Scanner(this.tokens) {
-    tokenIterator = tokens.iterator();
+    tokenIterator = tokens.iterator;
     advance();
   }
 
   bool hasMore() => current != null;
 
   void advance() {
-    current = tokenIterator.hasNext ? tokenIterator.next() : null;
+    current = tokenIterator.moveNext() ? tokenIterator.current : null;
   }
 }