Fix for class members cannot have the same name as the class in dart2js

lib/compiler/implementation/warnings.dart

Index: lib/compiler/implementation/warnings.dart
diff --git a/lib/compiler/implementation/warnings.dart b/lib/compiler/implementation/warnings.dart
index e938bbfab17b114555e9e74531b7ffa9475009fc..230fe2ebd4b776c1e46c3efb658e605adbc8ced6 100644
--- a/lib/compiler/implementation/warnings.dart
+++ b/lib/compiler/implementation/warnings.dart
@@ -213,6 +213,15 @@ class MessageKind {
   static final BAD_ARITY_OVERRIDE_CONT = const MessageKind(
       "Info: this is the method whose parameters do not match.");
 
+  static final CONSTRUCTOR_WITH_RETURN_TYPE = const MessageKind(
+      "Error: cannot have return type for constructor.");
+
+  static final ILLEGAL_FINAL_METHOD_MODIFIER = const MessageKind(
+      "Error: cannot have final modifier on method.");
+
+  static final ILLEGAL_CONSTRUCTOR_MODIFIERS = const MessageKind(
+      "Error: illegal constructor modifiers: #{1}.");
+
   static final COMPILER_CRASHED = const MessageKind(
       "Error: The compiler crashed when compiling this element.");