Use dartfmt on Observatory code

runtime/observatory/lib/src/repositories/allocation_profile.dart

 // Copyright (c) 2016, 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
 
 part of repositories;
 
 class AllocationProfileRepository implements M.AllocationProfileRepository {
   static const _api = '_getAllocationProfile';
 
-  Future<M.AllocationProfile> get(M.IsolateRef i, {bool gc: false,
-                                                   bool reset: false}) async {
+  Future<M.AllocationProfile> get(M.IsolateRef i,
+      {bool gc: false, bool reset: false}) async {
     assert(gc != null);
     assert(reset != null);
     S.Isolate isolate = i as S.Isolate;
     assert(isolate != null);
     var params = {};
     if (gc == true) {
       params['gc'] = 'full';
     }
     if (reset == true) {
       params['reset'] = true;
     }
     final response = await isolate.invokeRpc(_api, params);
     isolate.updateHeapsFromMap(response['heaps']);
     for (S.ServiceMap clsAllocations in response['members']) {
       S.Class cls = clsAllocations['class'];
       if (cls == null) {
         continue;
       }
       cls.newSpace.update(clsAllocations['new']);
       cls.oldSpace.update(clsAllocations['old']);
     }
     return new AllocationProfile(response);
   }
 }