Re-land:

chrome/browser/chromeos/frame/bubble_window.h

 // Copyright (c) 2010 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_BROWSER_CHROMEOS_FRAME_BUBBLE_WINDOW_H_
 #define CHROME_BROWSER_CHROMEOS_FRAME_BUBBLE_WINDOW_H_
 #pragma once
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "views/window/window_gtk.h"
@@ skipping 20 matching lines @@
   };
 
   static views::Window* Create(gfx::NativeWindow parent,
                                const gfx::Rect& bounds,
                                Style style,
                                views::WindowDelegate* window_delegate);
 
   static const SkColor kBackgroundColor;
 
  protected:
-  BubbleWindow();
+  explicit BubbleWindow(views::Window* window);
 
   // Overidden from views::WindowGtk:
   virtual void InitNativeWidget(
       const views::Widget::InitParams& params) OVERRIDE;
 
   // Trims the window margins and rounds off the corners.
   void TrimMargins(int margin_left, int margin_right, int margin_top,
                    int margin_bottom, int border_radius);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_FRAME_BUBBLE_WINDOW_H_