Run dartfmt on kernel package

pkg/kernel/lib/target/vm.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 kernel.target.vm;
 
 import '../ast.dart';
 import '../class_hierarchy.dart';
 import '../core_types.dart';
 import '../transformations/continuation.dart' as cont;
 import '../transformations/erasure.dart';
@@ skipping 74 matching lines @@
     if (strongMode) {
       new Erasure().transform(program);
     }
 
     new SanitizeForVM().transform(program);
   }
 
   void performTreeShaking(Program program) {
     var coreTypes = new CoreTypes(program);
     new TreeShaker(program,
-        hierarchy: _hierarchy,
-        coreTypes: coreTypes,
-        strongMode: strongMode,
-        programRoots: flags.programRoots)
+            hierarchy: _hierarchy,
+            coreTypes: coreTypes,
+            strongMode: strongMode,
+            programRoots: flags.programRoots)
         .transform(program);
     _hierarchy = null; // Hierarchy must be recomputed.
   }
 }