Move the download code to new directories:

chrome/browser/download/download_file.cc

 // 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.
 
 #include <Windows.h>
 #include <objbase.h>
 
-#include "chrome/browser/download_file.h"
+#include "chrome/browser/download/download_file.h"
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
 #include "base/string_util.h"
 #include "base/task.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/download_manager.h"
+#include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/resource_dispatcher_host.h"
 #include "chrome/browser/tab_contents.h"
 #include "chrome/browser/tab_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/stl_util-inl.h"
 #include "chrome/common/win_util.h"
 #include "chrome/common/win_safe_util.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/net_util.h"
@@ skipping 544 matching lines @@
 
   if (downloads_.empty())
     ui_loop_->PostTask(FROM_HERE, NewRunnableMethod(
         this, &DownloadFileManager::StopUpdateTimer));
 }
 
 void DownloadFileManager::CreateDirectory(const std::wstring& directory) {
   if (!file_util::PathExists(directory))
     file_util::CreateDirectory(directory);
 }