Reset settings button when update the list view.

ash/common/system/ime/tray_ime_chromeos.cc

 // Copyright (c) 2012 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 "ash/common/system/ime/tray_ime_chromeos.h"
 
 #include <vector>
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
@@ skipping 133 matching lines @@
   }
 
  private:
   // ImeListView:
   void HandleViewClicked(views::View* view) override {
     ImeListView::HandleViewClicked(view);
     if (view == settings_)
       ShowSettings();
   }
 
+  void ResetImeListView() override {
+    ImeListView::ResetImeListView();
+    settings_button_ = nullptr;
+  }
+
   void HandleButtonPressed(views::Button* sender,
                            const ui::Event& event) override {
     ImeListView::HandleButtonPressed(sender, event);
     if (sender == settings_button_)
       ShowSettings();
   }
 
   void CreateExtraTitleRowButtons() override {
     if (MaterialDesignController::IsSystemTrayMenuMaterial()) {
-      // It is possible that the settings button has already been created
-      // through a previous call to Update().
-      if (settings_button_)
-        return;
-
       tri_view()->SetContainerVisible(TriView::Container::END, true);
       settings_button_ = CreateSettingsButton(login_);
       tri_view()->AddView(TriView::Container::END, settings_button_);
     }
   }
 
   void AppendSettings() {
     HoverHighlightView* container = new HoverHighlightView(this);
     container->AddLabel(
         ui::ResourceBundle::GetSharedInstance().GetLocalizedString(
@@ skipping 165 matching lines @@
   else
     Update();
 }
 
 bool TrayIME::ShouldDefaultViewBeVisible() {
   return is_visible_ && (ime_list_.size() > 1 || property_list_.size() > 1 ||
                          ShouldShowKeyboardToggle());
 }
 
 }  // namespace ash