Mirror API removals: async invocations, mirrorSystemOf(port), Mirror.mirrors.

sdk/lib/_internal/lib/mirrors_patch.dart

Index: sdk/lib/_internal/lib/mirrors_patch.dart
diff --git a/sdk/lib/_internal/lib/mirrors_patch.dart b/sdk/lib/_internal/lib/mirrors_patch.dart
index b100937485d9fb9dad2ae6af43efd7bcb9eb665d..71c1e68c7b55a3538910eddf6f628846c16b738d 100644
--- a/sdk/lib/_internal/lib/mirrors_patch.dart
+++ b/sdk/lib/_internal/lib/mirrors_patch.dart
@@ -16,10 +16,6 @@ patch class MirrorSystem {
 
 patch MirrorSystem currentMirrorSystem() => js.currentJsMirrorSystem;
 
-patch Future<MirrorSystem> mirrorSystemOf(SendPort port) {
-  throw new UnsupportedError("MirrorSystem not implemented");
-}
-
 patch InstanceMirror reflect(Object reflectee) => js.reflect(reflectee);
 
 patch ClassMirror reflectClass(Type key) {
@@ -38,4 +34,4 @@ patch TypeMirror reflectType(Type key) {
     return currentMirrorSystem().dynamicType;
   }
   return js.reflectType(key);
-}
+}