Convert GetPreferredSize from:...

chrome/views/bitmap_scroll_bar.h

 // Copyright (c) 2006-2008 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 CHROME_VIEWS_BITMAP_SCROLL_BAR_H__
 #define CHROME_VIEWS_BITMAP_SCROLL_BAR_H__
 
 #include "chrome/views/button.h"
 #include "chrome/views/menu.h"
 #include "chrome/views/repeat_controller.h"
@@ skipping 69 matching lines @@
   // Scroll the contents to the appropriate position given the supplied
   // position of the thumb (thumb track coordinates). If |scroll_to_middle| is
   // true, then the conversion assumes |thumb_position| is in the middle of the
   // thumb rather than the top.
   void ScrollToThumbPosition(int thumb_position, bool scroll_to_middle);
 
   // Scroll the contents by the specified offset (contents coordinates).
   void ScrollByContentsOffset(int contents_offset);
 
   // View overrides:
-  virtual void GetPreferredSize(CSize* preferred_size);
+  virtual gfx::Size GetPreferredSize();
   virtual void Paint(ChromeCanvas* canvas);
   virtual void Layout();
   virtual void DidChangeBounds(const CRect& previous, const CRect& current);
   virtual bool OnMousePressed(const MouseEvent& event);
   virtual void OnMouseReleased(const MouseEvent& event, bool canceled);
   virtual bool OnMouseWheel(const MouseWheelEvent& event);
   virtual bool OnKeyPressed(const KeyEvent& event);
 
   // BaseButton::ButtonListener overrides:
   virtual void ButtonPressed(BaseButton* sender);
@@ skipping 75 matching lines @@
   // True if the scroll buttons at each end of the scroll bar should be shown.
   bool show_scroll_buttons_;
 
   DISALLOW_EVIL_CONSTRUCTORS(BitmapScrollBar);
 };
 
 }
 
 #endif  // #ifndef CHROME_VIEWS_BITMAP_SCROLL_BAR_H__