views: Make view::Views::GetPreferredSize() const.

ui/views/controls/table/table_header.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_TABLE_TABLE_HEADER_H_
 #define UI_VIEWS_CONTROLS_TABLE_TABLE_HEADER_H_
 
 #include "ui/gfx/font_list.h"
 #include "ui/views/view.h"
 #include "ui/views/views_export.h"
@@ skipping 12 matching lines @@
   static const int kSortIndicatorWidth;
 
   explicit TableHeader(TableView* table);
   virtual ~TableHeader();
 
   const gfx::FontList& font_list() const { return font_list_; }
 
   // views::View overrides.
   virtual void Layout() OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
-  virtual gfx::Size GetPreferredSize() OVERRIDE;
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
   virtual gfx::NativeCursor GetCursor(const ui::MouseEvent& event) OVERRIDE;
   virtual bool OnMousePressed(const ui::MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const ui::MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
 
  private:
   // Used to track the column being resized.
   struct ColumnResizeDetails {
@@ skipping 32 matching lines @@
 
   // If non-null a resize is in progress.
   scoped_ptr<ColumnResizeDetails> resize_details_;
 
   DISALLOW_COPY_AND_ASSIGN(TableHeader);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TABLE_TABLE_HEADER_H_