Fix more lint style issues in runtime patches.

runtime/lib/mirrors_impl.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // VM-specific implementation of the dart:mirrors library.
 
+import "dart:collection" show UnmodifiableListView, UnmodifiableMapView;
+import "dart:_internal" as internal;
+
 var _dirty = false;
 final _emptyList = new UnmodifiableListView([]);
 
 class _InternalMirrorError {
   final String _msg;
   const _InternalMirrorError(this._msg);
   String toString() => _msg;
 }
 
 String _n(Symbol symbol) => internal.Symbol.getName(symbol);
@@ skipping 1662 matching lines @@
   }
 
   static Type _instantiateType(Type key, List<Type> typeArguments) {
     if (typeArguments.isEmpty) {
       throw new ArgumentError.value(
         typeArguments, 'typeArguments', 'Type arguments list cannot be empty.');
     }
     return instantiateGenericType(key, typeArguments.toList(growable: false));
   }
 }