Removing deprecated GTK-Views code.

ui/views/controls/native_control_gtk.h

-// Copyright (c) 2011 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_CONTROLS_NATIVE_CONTROL_GTK_H_
-#define UI_VIEWS_CONTROLS_NATIVE_CONTROL_GTK_H_
-#pragma once
-
-#include <gtk/gtk.h>
-
-#include "base/compiler_specific.h"
-#include "ui/views/controls/native/native_view_host.h"
-
-namespace views {
-
-// A View that hosts a native control.
-class NativeControlGtk : public NativeViewHost {
- public:
-  NativeControlGtk();
-  virtual ~NativeControlGtk();
-
-  // Overridden from View:
-  virtual void OnEnabledChanged() OVERRIDE;
-
- protected:
-  virtual void ViewHierarchyChanged(bool is_add,
-                                    View *parent,
-                                    View *child) OVERRIDE;
-  virtual void VisibilityChanged(View* starting_from, bool is_visible) OVERRIDE;
-  virtual void OnFocus() OVERRIDE;
-
-  // Called when the NativeControlGtk is attached to a View hierarchy with a
-  // valid Widget. The NativeControlGtk should use this opportunity to create
-  // its associated GtkWidget.
-  virtual void CreateNativeControl() = 0;
-
-  // MUST be called by the subclass implementation of |CreateNativeControl|
-  // immediately after creating the control GtkWidget, otherwise it won't be
-  // attached to the GtkView and will be effectively orphaned.
-  virtual void NativeControlCreated(GtkWidget* widget);
-
- private:
-  static gboolean CallFocusIn(GtkWidget* gtk_widget,
-                              GdkEventFocus* event,
-                              NativeControlGtk* button);
-
-  DISALLOW_COPY_AND_ASSIGN(NativeControlGtk);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_NATIVE_CONTROL_GTK_H_