Run dartfmt on all files under runtime.

runtime/tests/vm/dart/double_materialize_test.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.
 
 // VMOptions=--optimization_counter_threshold=10 --no-use-osr --no-background-compilation
 
 import "package:expect/expect.dart";
 
 double f(double x, double five, dynamic y) {
   double z = x + five;
   var a = y + 5;
   return z + a.toDouble();
 }
 
 void main() {
   double x = 1.0;
   for (int i = 0; i < 1000; i++) {
     x = f(x, 5.0, i);
   }
   x = f(x, 5.0, 1.0);
   Expect.equals(509512.0, x);
 }
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