Format all tests.

tests/language/integer_division_by_zero_test.dart

 // Copyright (c) 2013, 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.
 // Test integer division by zero.
 // Test that results before and after optimization are the same.
 // VMOptions=--optimization-counter-threshold=10 --no-use-osr --no-background-compilation
 
 import "package:expect/expect.dart";
 
 divBy0(a) => a ~/ 0;
 
 main() {
-  Expect.throws(() => divBy0(4),
-                (e) => e is IntegerDivisionByZeroException);
+  Expect.throws(() => divBy0(4), (e) => e is IntegerDivisionByZeroException);
 }