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

ash/system/tray/tray_details_view.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 "ash/system/tray/tray_details_view.h"
 
 #include "ash/system/tray/fixed_sized_scroll_view.h"
 #include "ash/system/tray/system_tray.h"
 #include "ash/system/tray/system_tray_item.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ui/gfx/canvas.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/scroll_view.h"
 #include "ui/views/layout/box_layout.h"
 
 namespace ash {
 
 class ScrollSeparator : public views::View {
  public:
   ScrollSeparator() {}
 
   virtual ~ScrollSeparator() {}
 
  private:
   // Overriden from views::View.
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
     canvas->FillRect(gfx::Rect(0, height() / 2, width(), 1), kBorderLightColor);
   }
-  virtual gfx::Size GetPreferredSize() OVERRIDE {
+  virtual gfx::Size GetPreferredSize() const OVERRIDE {
     return gfx::Size(1, kTrayPopupScrollSeparatorHeight);
   }
 
   DISALLOW_COPY_AND_ASSIGN(ScrollSeparator);
 };
 
 class ScrollBorder : public views::Border {
  public:
   ScrollBorder() {}
   virtual ~ScrollBorder() {}
@@ skipping 118 matching lines @@
     if (index < child_count() - 1 && child_at(index + 1) != footer_)
       scroll_border_->set_visible(true);
     else
       scroll_border_->set_visible(false);
   }
 
   views::View::OnPaintBorder(canvas);
 }
 
 }  // namespace ash