Use the native frame for the task manager on Linux Aura

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 
@@ skipping 99 matching lines @@
   virtual void ClearNativeFocus() OVERRIDE;
   virtual Widget::MoveLoopResult RunMoveLoop(
       const gfx::Vector2d& drag_offset,
       Widget::MoveLoopSource source,
       Widget::MoveLoopEscapeBehavior escape_behavior) OVERRIDE;
   virtual void EndMoveLoop() OVERRIDE;
   virtual void SetVisibilityChangedAnimationsEnabled(bool value) OVERRIDE;
   virtual bool ShouldUseNativeFrame() const OVERRIDE;
   virtual bool ShouldWindowContentsBeTransparent() const OVERRIDE;
   virtual void FrameTypeChanged() OVERRIDE;
-  virtual NonClientFrameView* CreateNonClientFrameView() OVERRIDE;
   virtual void SetFullscreen(bool fullscreen) OVERRIDE;
   virtual bool IsFullscreen() const OVERRIDE;
   virtual void SetOpacity(unsigned char opacity) OVERRIDE;
   virtual void SetWindowIcons(const gfx::ImageSkia& window_icon,
                               const gfx::ImageSkia& app_icon) OVERRIDE;
   virtual void InitModalType(ui::ModalType modal_type) OVERRIDE;
   virtual void FlashFrame(bool flash_frame) OVERRIDE;
   virtual void OnRootViewLayout() const OVERRIDE;
   virtual void OnNativeWidgetFocus() OVERRIDE;
   virtual void OnNativeWidgetBlur() OVERRIDE;
@@ skipping 167 matching lines @@
   // attention to the window or completely ignore the hint. We stop flashing
   // the frame when |xwindow_| gains focus or handles a mouse button event.
   bool urgency_hint_set_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_