Revert of Merge NativeTextfieldViews into views::Textfield.

ui/base/touch/touch_editing_controller.h

 // Copyright (c) 2013 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_BASE_TOUCH_TOUCH_EDITING_CONTROLLER_H_
 #define UI_BASE_TOUCH_TOUCH_EDITING_CONTROLLER_H_
 
 #include "ui/base/models/simple_menu_model.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
@@ skipping 20 matching lines @@
   //                  ^p1           ^p2
   //
   // p1 should be the logical start and p2 the logical end of selection. Hence,
   // visually, p1 could be to the right of p2 in the figure above.
   virtual void GetSelectionEndPoints(gfx::Rect* p1, gfx::Rect* p2) = 0;
 
   // Gets the bounds of the client view in parent's coordinates.
   virtual gfx::Rect GetBounds() = 0;
 
   // Gets the NativeView hosting the client.
-  virtual gfx::NativeView GetNativeView() const = 0;
+  virtual gfx::NativeView GetNativeView() = 0;
 
   // Converts a point to/from screen coordinates from/to client view.
   virtual void ConvertPointToScreen(gfx::Point* point) = 0;
   virtual void ConvertPointFromScreen(gfx::Point* point) = 0;
 
   // Returns true if the editable draws its own handles (hence, the
   // TouchSelectionController need not draw handles).
   virtual bool DrawsHandles() = 0;
 
   // Tells the editable to open context menu.
@@ skipping 26 matching lines @@
 
   virtual TouchSelectionController* create(TouchEditable* client_view) = 0;
 
  protected:
   virtual ~TouchSelectionControllerFactory() {}
 };
 
 }  // namespace views
 
 #endif  // UI_BASE_TOUCH_TOUCH_EDITING_CONTROLLER_H_