Remove a lot of no-longer-used functionality from DecoratedTextfield.

ui/views/controls/textfield/textfield.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_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 132 matching lines @@
 
   // Sets the default width of the text control. See default_width_in_chars_.
   void set_default_width_in_chars(int default_width) {
     default_width_in_chars_ = default_width;
   }
 
   // Sets the text to display when empty.
   void set_placeholder_text(const base::string16& text) {
     placeholder_text_ = text;
   }
-  virtual base::string16 GetPlaceholderText() const;
+  base::string16 GetPlaceholderText() const;
 
   SkColor placeholder_text_color() const { return placeholder_text_color_; }
   void set_placeholder_text_color(SkColor color) {
     placeholder_text_color_ = color;
   }
 
   // Get or set the horizontal alignment used for the button from the underlying
   // RenderText object.
   gfx::HorizontalAlignment GetHorizontalAlignment() const;
   void SetHorizontalAlignment(gfx::HorizontalAlignment alignment);
@@ skipping 320 matching lines @@
 
   // Used to bind callback functions to this object.
   base::WeakPtrFactory<Textfield> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Textfield);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_