Don't use deprecated ListValue::Append(Value*) overload.

chrome/browser/ui/webui/copresence_ui_handler.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/copresence_ui_handler.h"
 
 #include <map>
+#include <memory>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/i18n/time_formatting.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/copresence/copresence_api.h"
 #include "components/copresence/proto/data.pb.h"
@@ skipping 186 matching lines @@
 
   // CopresenceService::ResetState() deletes the CopresenceState object
   // we were using. We have to get the new one and reconnect to it.
   state_ = GetCopresenceState(service);
   DCHECK(state_);
   state_->AddObserver(this);
 
   web_ui()->CallJavascriptFunctionUnsafe("clearTokens");
   DirectivesUpdated();
 }