Move the download code to new directories:

chrome/browser/download/download_item_model.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_BROWSER_DOWNLOAD_ITEM_MODEL_H__
-#define CHROME_BROWSER_DOWNLOAD_ITEM_MODEL_H__
+#ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_MODEL_H__
+#define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_MODEL_H__
 
 #include "chrome/browser/views/download_item_view.h"
 
 class DownloadItem;
 
 // This class is a model class for DownloadItemView. It provides functionality
 // for canceling the downloading, and also the text for displaying downloading
 // status.
 class DownloadItemModel : public DownloadItemView::BaseDownloadItemModel {
  public:
   DownloadItemModel(DownloadItem* download);
   virtual ~DownloadItemModel() { }
 
   // Cancel the downloading.
   virtual void CancelTask();
 
   // Get downloading status text.
   virtual std::wstring GetStatusText();
 
  private:
   // We query this item for status information.
   DownloadItem* download_;
 
   DISALLOW_EVIL_CONSTRUCTORS(DownloadItemModel);
 };
 
-#endif  // CHROME_BROWSER_DOWNLOAD_ITEM_MODEL_H__
+#endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_ITEM_MODEL_H__