Run dartfmt on all files under runtime.

runtime/observatory/tests/service/get_retaining_path_rpc_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';
 
@@ skipping 44 matching lines @@
 
   // missing limit.
   (Isolate isolate) async {
     var obj = await eval(isolate, 'globalObject');
     var params = {
       'targetId': obj['id'],
     };
     bool caughtException;
     try {
       await isolate.invokeRpcNoUpgrade('_getRetainingPath', params);
-      expect(false, isTrue, reason:'Unreachable');
+      expect(false, isTrue, reason: 'Unreachable');
     } on ServerRpcException catch (e) {
       caughtException = true;
       expect(e.code, equals(ServerRpcException.kInvalidParams));
       expect(e.data['details'],
-             "_getRetainingPath expects the \'limit\' parameter");
+          "_getRetainingPath expects the \'limit\' parameter");
     }
     expect(caughtException, isTrue);
   },
 
   (Isolate isolate) async {
     var target1 = await eval(
         isolate, '() { var tmp = target1; target1 = null; return tmp;} ()');
     var params = {
       'targetId': target1['id'],
       'limit': 100,
@@ skipping 36 matching lines @@
   (Isolate isolate) async {
     var target4 = await eval(
         isolate, '() { var tmp = target4; target4 = null; return tmp;} ()');
     var params = {
       'targetId': target4['id'],
       'limit': 100,
     };
     var result = await isolate.invokeRpcNoUpgrade('_getRetainingPath', params);
     expect(result['type'], equals('RetainingPath'));
     expect(result['elements'].length, equals(3));
-    expect(result['elements'][1]['parentMapKey']['valueAsString'],
-        equals('key'));
+    expect(
+        result['elements'][1]['parentMapKey']['valueAsString'], equals('key'));
     expect(result['elements'][2]['value']['name'], equals('globalMap1'));
   },
 
   (Isolate isolate) async {
     var target5 = await eval(
         isolate, '() { var tmp = target5; target5 = null; return tmp;} ()');
     var params = {
       'targetId': target5['id'],
       'limit': 100,
     };
     var result = await isolate.invokeRpcNoUpgrade('_getRetainingPath', params);
     expect(result['type'], equals('RetainingPath'));
     expect(result['elements'].length, equals(3));
     expect(result['elements'][1]['parentMapKey']['class']['name'],
-      equals('_TestClass'));
+        equals('_TestClass'));
     expect(result['elements'][2]['value']['name'], equals('globalMap2'));
   }
 ];
 
-main(args) async => runIsolateTests(args, tests, testeeBefore:warmup);
+main(args) async => runIsolateTests(args, tests, testeeBefore: warmup);