Remove WINDOW_TYPE_V1_PANEL AppWindow type

chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.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 "chrome/browser/ui/views/apps/chrome_native_app_window_views_aura_ash.h"
 
 #include "apps/ui/views/app_window_frame_view.h"
 #include "ash/ash_constants.h"
 #include "ash/ash_switches.h"
 #include "ash/frame/custom_frame_view_ash.h"
@@ skipping 148 matching lines @@
       int display_id = display::Screen::GetScreen()->GetPrimaryDisplay().id();
       init_params
           ->mus_properties[ui::mojom::WindowManager::kDisplayId_InitProperty] =
           mojo::ConvertTo<std::vector<uint8_t>>(display_id);
     } else {
       init_params->parent = ash::Shell::GetContainer(
           ash::Shell::GetPrimaryRootWindow(), container_id);
     }
   }
   DCHECK_NE(AppWindow::WINDOW_TYPE_PANEL, create_params.window_type);
-  DCHECK_NE(AppWindow::WINDOW_TYPE_V1_PANEL, create_params.window_type);
   init_params->mus_properties
       [ui::mojom::WindowManager::kRemoveStandardFrame_InitProperty] =
       mojo::ConvertTo<std::vector<uint8_t>>(init_params->remove_standard_frame);
 }
 
 void ChromeNativeAppWindowViewsAuraAsh::OnBeforePanelWidgetInit(
     views::Widget::InitParams* init_params,
     views::Widget* widget) {
   ChromeNativeAppWindowViewsAura::OnBeforePanelWidgetInit(init_params,
                                                           widget);
@@ skipping 197 matching lines @@
     bool activate_on_pointer) {
   widget()->GetNativeWindow()->SetProperty(aura::client::kActivateOnPointerKey,
                                            activate_on_pointer);
 }
 
 void ChromeNativeAppWindowViewsAuraAsh::OnMenuClosed() {
   menu_runner_.reset();
   menu_model_adapter_.reset();
   menu_model_.reset();
 }