Run dartfmt on pkg/front_end/lib.

pkg/front_end/lib/src/fasta/builder/modifier_builder.dart

 // Copyright (c) 2016, 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 fasta.modifier_builder;
 
-import '../modifier.dart' show
-    abstractMask,
-    constMask,
-    externalMask,
-    finalMask,
-    staticMask;
+import '../modifier.dart'
+    show abstractMask, constMask, externalMask, finalMask, staticMask;
 
-import 'builder.dart' show
-    Builder;
+import 'builder.dart' show Builder;
 
 abstract class ModifierBuilder extends Builder {
   ModifierBuilder(Builder parent, int charOffset, [Uri fileUri])
       : super(parent, charOffset, fileUri ?? parent?.fileUri);
 
   int get modifiers;
 
   bool get isAbstract => (modifiers & abstractMask) != 0;
 
   bool get isConst => (modifiers & constMask) != 0;
 
   bool get isExternal => (modifiers & externalMask) != 0;
 
   bool get isFinal => (modifiers & finalMask) != 0;
 
   bool get isStatic => (modifiers & staticMask) != 0;
 }