Fix DDC errors on DDC

lib/src/js/printer.dart

Index: lib/src/js/printer.dart
diff --git a/lib/src/js/printer.dart b/lib/src/js/printer.dart
index 0eb5ff8dd7f62f77a9eee5cf5a7fe56972413bc9..30288a7f211bcc3c322c22b4c46ca6cd9c5d429d 100644
--- a/lib/src/js/printer.dart
+++ b/lib/src/js/printer.dart
@@ -1266,7 +1266,7 @@ class DanglingElseVisitor extends BaseVisitor<bool> {
   bool visitLabeledStatement(LabeledStatement node)
       => node.body.accept(this);
   bool visitLiteralStatement(LiteralStatement node) => true;
-  bool visitClassDeclaration(ClassDeclaration) => false;
+  bool visitClassDeclaration(ClassDeclaration node) => false;

[Paul Berry, 2015/06/01 22:00:45]

Very cool that DDC caught this!  Incidentally, we have talked in the past about
making a lint heuristic to detect this sort of mistake, but I couldn't find
anything in the bug system about it.  I'm not sure if we decided it was
infeasible for some reason or just forgot about it :)

 
   bool visitExpression(Expression node) => false;
 }