Improve type literals in minified mode.

dart/sdk/lib/_internal/lib/js_mirrors.dart

Index: dart/sdk/lib/_internal/lib/js_mirrors.dart
diff --git a/dart/sdk/lib/_internal/lib/js_mirrors.dart b/dart/sdk/lib/_internal/lib/js_mirrors.dart
index 25ca338013bc55ae1f739a0cf0dca130b6874d38..7211182f7b6a61af720c7d33848c2ade7ed1f276 100644
--- a/dart/sdk/lib/_internal/lib/js_mirrors.dart
+++ b/dart/sdk/lib/_internal/lib/js_mirrors.dart
@@ -24,6 +24,7 @@ import 'dart:_js_helper' show
     RuntimeError,
     createRuntimeType,
     createUnmangledInvocationMirror,
+    getMangledTypeName,
     runtimeTypeToString;
 import 'dart:_interceptors' show
     Interceptor,
@@ -392,7 +393,7 @@ InstanceMirror reflect(Object reflectee) {
 }
 
 ClassMirror reflectType(Type key) {
-  return reflectClassByMangledName('$key'.split('<')[0]);
+  return reflectClassByMangledName(getMangledTypeName(key).split('<')[0]);
 }
 
 ClassMirror reflectClassByMangledName(String mangledName) {