Format all tests.

tests/language/part_of_uri_test.dart

 // Copyright (c) 2017, 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.
 
 // No library declaration
-part "part_of_uri_part.dart";  // declares bar1, baz1
-part "part_of_uri_part2.dart";  // declares bar2, baz2
+part "part_of_uri_part.dart"; // declares bar1, baz1
+part "part_of_uri_part2.dart"; // declares bar2, baz2
 
 const foo = 'foo';
 const qux = "$baz1$baz2";
 
 main() {
   if (!identical(qux, "foopart21foopart12")) throw "Fail: $qux";
 }