Run dartfmt on all files under runtime.

runtime/observatory/tests/service/next_through_catch_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 = 12;
 const String file = "next_through_catch_test.dart";
 
 code() {
   try {
     var value = "world";
     throw "Hello, $value";
-  } catch(e, st) {
+  } catch (e, st) {
     print(e);
     print(st);
   }
   try {
     throw "Hello, world";
-  } catch(e, st) {
+  } catch (e, st) {
     print(e);
     print(st);
   }
 }
 
 List<String> stops = [];
 List<String> expected = [
   "$file:${LINE_A+1}:15", // on '='
   "$file:${LINE_A+2}:26", // after last '"' (i.e. before ';')
   "$file:${LINE_A+4}:5", // on call to 'print'
   "$file:${LINE_A+5}:5", // on call to 'print'
   "$file:${LINE_A+8}:5", // on 'throw'
   "$file:${LINE_A+10}:5", // on call to 'print'
   "$file:${LINE_A+11}:5", // on call to 'print'
   "$file:${LINE_A+13}:1" // on ending '}'
 ];
 
 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);
 }