Use aura::WindowProperty for title and name strings.

ui/views/mus/desktop_window_tree_host_mus.cc

 // Copyright 2016 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 "ui/views/mus/desktop_window_tree_host_mus.h"
 
 #include "base/memory/ptr_util.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/drag_drop_client.h"
 #include "ui/aura/client/focus_client.h"
@@ skipping 302 matching lines @@
 
 void DesktopWindowTreeHostMus::SetVisibleOnAllWorkspaces(bool always_visible) {
   // Not applicable to chromeos.
 }
 
 bool DesktopWindowTreeHostMus::IsVisibleOnAllWorkspaces() const {
   return false;
 }
 
 bool DesktopWindowTreeHostMus::SetWindowTitle(const base::string16& title) {
-  if (window()->title() == title)
+  if (window()->GetTitle() == title)
     return false;
   window()->SetTitle(title);
   return true;
 }
 
 void DesktopWindowTreeHostMus::ClearNativeFocus() {
   aura::client::FocusClient* client = aura::client::GetFocusClient(window());
   if (client && window()->Contains(client->GetFocusedWindow()))
     client->ResetFocusWithinActiveWindow(window());
 }
@@ skipping 120 matching lines @@
   if (window == this->window()) {
     is_active_ = true;
     desktop_native_widget_aura_->HandleActivationChanged(true);
   } else if (is_active_) {
     is_active_ = false;
     desktop_native_widget_aura_->HandleActivationChanged(false);
   }
 }
 
 }  // namespace views