All strong mode cleaning of dart2js.

pkg/compiler/lib/src/resolution/resolution_common.dart

Index: pkg/compiler/lib/src/resolution/resolution_common.dart
diff --git a/pkg/compiler/lib/src/resolution/resolution_common.dart b/pkg/compiler/lib/src/resolution/resolution_common.dart
index ffca163ee8146f40c6d6c14300ed1fcd927b2aaf..4428cd3eb67f1742f05fbbc28641ffdaf9352041 100644
--- a/pkg/compiler/lib/src/resolution/resolution_common.dart
+++ b/pkg/compiler/lib/src/resolution/resolution_common.dart
@@ -26,7 +26,7 @@ class CommonResolverVisitor<R> extends Visitor<R> {
         node, 'internal error: Unhandled node: ${node.getObjectDescription()}');
   }
 
-  R visitEmptyStatement(Node node) => null;
+  R visitEmptyStatement(EmptyStatement node) => null;
 
   /** Convenience method for visiting nodes that may be null. */
   R visit(Node node) => (node == null) ? null : node.accept(this);