Run dartfmt on all files under runtime.

runtime/observatory/tests/service/next_through_function_expression_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.
 
 import 'test_helper.dart';
 import 'service_test_common.dart';
 
 const int LINE_A = 11;
 const String file = "next_through_function_expression_test.dart";
 
 codeXYZ(int i) {
   innerOne() {
     return i * i;
   }
+
   return innerOne();
 }
 
 code() {
   codeXYZ(42);
 }
 
 List<String> stops = [];
 List<String> expected = [
   "$file:${LINE_A+0}:13", // on 'i' in 'codeXYZ(int i)'
   "$file:${LINE_A+1}:3", // on 'innerOne'
   "$file:${LINE_A+4}:18", // on '(', i.e. after 'innerOne' call
   "$file:${LINE_A+4}:3" // on 'return'
 ];
 
 var tests = [
   hasPausedAtStart,
   setBreakpointAtLine(LINE_A),
   runStepThroughProgramRecordingStops(stops),
   checkRecordedStops(stops, expected)
 ];
 
 main(args) {
   runIsolateTestsSynchronous(args, tests,
       testeeConcurrent: code, pause_on_start: true, pause_on_exit: true);
 }