Remove Unused AsTextButtonBorder RTTI helper.

ui/views/border.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_BORDER_H_
 #define UI_VIEWS_BORDER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "third_party/skia/include/core/SkColor.h"
@@ skipping 19 matching lines @@
 // view->SetBorder(Border::CreateSolidBorder(1, SkColorSetRGB(25, 25, 112));
 // Once set on a view, the border is owned by the view.
 //
 // IMPORTANT NOTE: not all views support borders at this point. In order to
 // support the border, views should make sure to use bounds excluding the
 // border (by calling View::GetLocalBoundsExcludingBorder) when doing layout and
 // painting.
 //
 ////////////////////////////////////////////////////////////////////////////////
 
-class TextButtonBorder;
-
 class VIEWS_EXPORT Border {
  public:
   Border();
   virtual ~Border();
 
   // Convenience for creating a scoped_ptr with no Border.
   static scoped_ptr<Border> NullBorder();
 
   // Creates a border that is a simple line of the specified thickness and
   // color.
@@ skipping 27 matching lines @@
   virtual gfx::Insets GetInsets() const = 0;
 
   // Returns the minimum size this border requires.  Note that this may not be
   // the same as the insets.  For example, a Border may paint images to draw
   // some graphical border around a view, and this would return the minimum size
   // such that these images would not be clipped or overlapping -- but the
   // insets may be larger or smaller, depending on how the view wanted its
   // content laid out relative to these images.
   virtual gfx::Size GetMinimumSize() const = 0;
 
-  // Manual RTTI for text buttons.
-  virtual TextButtonBorder* AsTextButtonBorder();
-  virtual const TextButtonBorder* AsTextButtonBorder() const;
-
  private:
   DISALLOW_COPY_AND_ASSIGN(Border);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_BORDER_H_