Run dartfmt on all files under runtime.

runtime/observatory/tests/service/issue_25465_test.dart

 // Copyright (c) 2015, 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=--error_on_bad_type --error_on_bad_override
 
 import 'package:observatory/service_io.dart';
 import 'package:unittest/unittest.dart';
 import 'test_helper.dart';
 import 'service_test_common.dart';
 import 'dart:async';
 
 const int LINE_A = 16;
 const int LINE_B = 17;
 
 testMain() {
-  var foo;      // line A
-  foo = 42;     // line B
+  var foo; // line A
+  foo = 42; // line B
   print(foo);
 }
 
 var tests = [
   hasPausedAtStart,
 
   // Add breakpoints at line 11 and line 12.
   (Isolate isolate) async {
     var rootLib = isolate.rootLibrary;
     await rootLib.load();
@@ skipping 36 matching lines @@
           completer.complete(null);
         }
       }
     });
     isolate.resume();
     await completer.future;
   },
 ];
 
 main(args) => runIsolateTests(args, tests,
-                              testeeConcurrent: testMain,
-                              pause_on_start: true);
+    testeeConcurrent: testMain, pause_on_start: true);