Make panel adjust bounds per preferred size change notification on Windows.

chrome/browser/tab_contents/background_contents.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_TAB_CONTENTS_BACKGROUND_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_BACKGROUND_CONTENTS_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 90 matching lines @@
                              int selected_item,
                              const std::vector<WebMenuItem>& items,
                              bool right_aligned) {}
   virtual void StartDragging(const WebDropData& drop_data,
                              WebKit::WebDragOperationsMask allowed_operations,
                              const SkBitmap& image,
                              const gfx::Point& image_offset) {}
   virtual void UpdateDragCursor(WebKit::WebDragOperation operation) {}
   virtual void GotFocus() {}
   virtual void TakeFocus(bool reverse) {}
-  virtual void UpdatePreferredSize(const gfx::Size& new_size) {}
 
   // NotificationObserver
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
 
   // Overridden from JavaScriptDialogDelegate:
   virtual void OnDialogClosed(IPC::Message* reply_msg,
                               bool success,
                               const string16& user_input) OVERRIDE;
@@ skipping 34 matching lines @@
   BackgroundContents* contents;
 
   // The name of the parent frame for these contents.
   const string16& frame_name;
 
   // The ID of the parent application (if any).
   const string16& application_id;
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_BACKGROUND_CONTENTS_H_