Rework the way Widget::Init works:

chrome/browser/ui/views/bubble/border_widget_win.h

 // Copyright (c) 2011 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_UI_VIEWS_BUBBLE_BORDER_WIDGET_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_BUBBLE_BORDER_WIDGET_WIN_H_
 #pragma once
 
 #include "chrome/browser/ui/views/bubble/bubble_border.h"
 #include "views/widget/widget_win.h"
 
 class BorderContents;
 
 // This is a window that surrounds the info bubble and paints the margin and
 // border.  It is a separate window so that it can be a layered window, so that
 // we can use >1-bit alpha shadow images on the borders, which look nicer than
 // the Windows CS_DROPSHADOW shadows.  The info bubble window itself cannot be a
 // layered window because that prevents it from hosting native child controls.
 class BorderWidgetWin : public views::WidgetWin {
  public:
   BorderWidgetWin();
   virtual ~BorderWidgetWin() { }
 
   // Initializes the BrowserWidget making |owner| its owning window.
-  void Init(BorderContents* border_contents, HWND owner);
+  void InitBorderWidgetWin(BorderContents* border_contents, HWND owner);
 
   // Given the size of the contained contents (without margins), and the rect
   // (in screen coordinates) to point to, sets the border window positions and
   // sizes the border window and returns the bounds (in screen coordinates) the
   // contents should use. |arrow_location| is prefered arrow location,
   // the function tries to preserve the location and direction, in case of RTL
   // arrow location is mirrored.
   virtual gfx::Rect SizeAndGetBounds(const gfx::Rect& position_relative_to,
                                      BubbleBorder::ArrowLocation arrow_location,
                                      const gfx::Size& contents_size);
 
   // Simple accessors.
   BorderContents* border_contents() { return border_contents_; }
 
  protected:
   BorderContents* border_contents_;
 
  private:
   // Overridden from WidgetWin:
   virtual LRESULT OnMouseActivate(UINT message,
                                   WPARAM w_param,
                                   LPARAM l_param) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(BorderWidgetWin);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_BUBBLE_BORDER_WIDGET_WIN_H_