Format all dart: library files

sdk/lib/html/dartium/nativewrappers.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.
 
 library nativewrappers;
 
-class NativeFieldWrapperClass1 { }
+class NativeFieldWrapperClass1 {}
 
-class NativeFieldWrapperClass2 { }
+class NativeFieldWrapperClass2 {}
 
-class NativeFieldWrapperClass3 { }
+class NativeFieldWrapperClass3 {}
 
-class NativeFieldWrapperClass4 { }
+class NativeFieldWrapperClass4 {}