Add metadata for type parameters (TypeVariableMirror).

runtime/lib/mirrors_impl.dart

Index: runtime/lib/mirrors_impl.dart
diff --git a/runtime/lib/mirrors_impl.dart b/runtime/lib/mirrors_impl.dart
index 534ded4614c1af696a87e1fe5c8f0e37879945a0..0487b586c7c7ba343d6fb2b5ccd8a36d81b1615f 100644
--- a/runtime/lib/mirrors_impl.dart
+++ b/runtime/lib/mirrors_impl.dart
@@ -769,7 +769,6 @@ class _LocalFunctionTypeMirrorImpl extends _LocalClassMirrorImpl
 
   Map<Symbol, Mirror> get members => new Map<Symbol,Mirror>();
   Map<Symbol, MethodMirror> get constructors => new Map<Symbol,MethodMirror>();
-  final Map<Symbol, TypeVariableMirror> typeVariables = const {};
 
   String toString() => "FunctionTypeMirror on '${_n(simpleName)}'";
 
@@ -847,11 +846,6 @@ class _LocalTypeVariableMirrorImpl extends _LocalDeclarationMirrorImpl
     return _upperBound;
   }
 
-  List<InstanceMirror> get metadata {
-    throw new UnimplementedError(
-        'TypeVariableMirror.metadata is not implemented');
-  }
-
   bool get isOriginalDeclaration => true;
   ClassMirror get originalDeclaration => this;