Remove MutationEvent bad entries in both removed list and renamed list

sdk/lib/js/dartium/cached_patches.dart

Index: sdk/lib/js/dartium/cached_patches.dart
diff --git a/sdk/lib/js/dartium/cached_patches.dart b/sdk/lib/js/dartium/cached_patches.dart
index 847abd51d9a2e6b0c47c23d9eca6bc134cc9ee86..34a56f4906950f5ba329335f9979f1bed977e458 100644
--- a/sdk/lib/js/dartium/cached_patches.dart
+++ b/sdk/lib/js/dartium/cached_patches.dart
@@ -3921,15 +3921,6 @@ class _HTMLMarqueeElementImpl extends _HTMLMarqueeElement implements js_library.
   get runtimeType => _HTMLMarqueeElement;
   toString() => super.toString();
 }
-patch class _MutationEvent {
-  static Type get instanceRuntimeType => _MutationEventImpl;
-
-}
-class _MutationEventImpl extends _MutationEvent implements js_library.JSObjectInterfacesDom {
-  _MutationEventImpl.internal_() : super.internal_();
-  get runtimeType => _MutationEvent;
-  toString() => super.toString();
-}
 patch class _NamedNodeMap {
   static Type get instanceRuntimeType => _NamedNodeMapImpl;