Update dart2js diagnostics to prepare for filtering.

sdk/lib/_internal/compiler/implementation/warnings.dart

Index: sdk/lib/_internal/compiler/implementation/warnings.dart
diff --git a/sdk/lib/_internal/compiler/implementation/warnings.dart b/sdk/lib/_internal/compiler/implementation/warnings.dart
index 014e40a20aaaa6b944ccf21ab7680febd4a2d820..aeafbbc59023a73319862c918db81b5c384655f7 100644
--- a/sdk/lib/_internal/compiler/implementation/warnings.dart
+++ b/sdk/lib/_internal/compiler/implementation/warnings.dart
@@ -1949,16 +1949,6 @@ class Diagnostic {
   String toString() => message.toString();
 }
 
-class TypeWarning extends Diagnostic {
-  TypeWarning(MessageKind kind, Map arguments, bool terse)
-    : super(kind, arguments, terse);
-}
-
-class ResolutionWarning extends Diagnostic {
-  ResolutionWarning(MessageKind kind, Map arguments, bool terse)
-    : super(kind, arguments, terse);
-}
-
 class CompileTimeConstantError extends Diagnostic {
   CompileTimeConstantError(MessageKind kind, Map arguments, bool terse)
     : super(kind, arguments, terse);