Remove base's implicit_cast.

chrome/browser/ui/views/apps/chrome_native_app_window_views_win.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/views/apps/chrome_native_app_window_views_win.h"
 
 #include "apps/ui/views/app_window_frame_view.h"
 #include "ash/shell.h"
 #include "base/command_line.h"
 #include "base/files/file_util.h"
@@ skipping 39 matching lines @@
 }
 
 HWND ChromeNativeAppWindowViewsWin::GetNativeAppWindowHWND() const {
   return views::HWNDForWidget(widget()->GetTopLevelWidget());
 }
 
 bool ChromeNativeAppWindowViewsWin::IsRunningInAsh() {
   if (!ash::Shell::HasInstance())
     return false;
 
-  views::Widget* widget =
-      implicit_cast<views::WidgetDelegate*>(this)->GetWidget();
+  views::Widget* widget = GetWidget();
   chrome::HostDesktopType host_desktop_type =
       chrome::GetHostDesktopTypeForNativeWindow(widget->GetNativeWindow());
   return host_desktop_type == chrome::HOST_DESKTOP_TYPE_ASH;
 }
 
 void ChromeNativeAppWindowViewsWin::EnsureCaptionStyleSet() {
   // Windows seems to have issues maximizing windows without WS_CAPTION.
   // The default views / Aura implementation will remove this if we are using
   // frameless or colored windows, so we put it back here.
   HWND hwnd = GetNativeAppWindowHWND();
@@ skipping 87 matching lines @@
   ActivateParentDesktopIfNecessary();
   ChromeNativeAppWindowViewsAura::Activate();
 }
 
 bool ChromeNativeAppWindowViewsWin::CanMinimize() const {
   // Resizing on Windows breaks translucency if the window also has shape.
   // See http://crbug.com/417947.
   return ChromeNativeAppWindowViewsAura::CanMinimize() &&
          !(WidgetHasHitTestMask() && is_translucent_);
 }