Remove Unused AsTextButtonBorder RTTI helper.

ui/views/controls/button/text_button.cc

 // 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.
 
 #include "ui/views/controls/button/text_button.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "grit/ui_resources.h"
@@ skipping 70 matching lines @@
 }
 
 gfx::Size TextButtonBorder::GetMinimumSize() const {
   return gfx::Size();
 }
 
 void TextButtonBorder::SetInsets(const gfx::Insets& insets) {
   insets_ = insets;
 }
 
-TextButtonBorder* TextButtonBorder::AsTextButtonBorder() {
-  return this;
-}
-
-const TextButtonBorder* TextButtonBorder::AsTextButtonBorder() const {
-  return this;
-}
-
 
 // TextButtonDefaultBorder ----------------------------------------------------
 
 TextButtonDefaultBorder::TextButtonDefaultBorder()
     : vertical_padding_(kPreferredPaddingVertical) {
   set_hot_painter(Painter::CreateImageGridPainter(kHotImages));
   set_pushed_painter(Painter::CreateImageGridPainter(kPushedImages));
   SetInsets(gfx::Insets(vertical_padding_, kPreferredPaddingHorizontal,
                         vertical_padding_, kPreferredPaddingHorizontal));
 }
@@ skipping 639 matching lines @@
   if (show_multiple_icon_states_) {
     if (has_hover_icon_ && (state() == STATE_HOVERED))
       return icon_hover_;
     if (has_pushed_icon_ && (state() == STATE_PRESSED))
       return icon_pushed_;
   }
   return icon_;
 }
 
 }  // namespace views