Update a bunch of files to the new location of browser_thread.h

chrome/browser/download/download_file.cc

 // 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.
 
 #include "chrome/browser/download/download_file.h"
 
 #include <string>
 
 #include "base/file_util.h"
 #include "base/stringprintf.h"
-#include "chrome/browser/browser_thread.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/history/download_create_info.h"
+#include "content/browser/browser_thread.h"
 
 DownloadFile::DownloadFile(const DownloadCreateInfo* info,
                            DownloadManager* download_manager)
     : BaseFile(info->save_info.file_path,
                info->url,
                info->referrer_url,
                info->received_bytes,
                info->save_info.file_stream),
       id_(info->download_id),
       child_id_(info->child_id),
@@ skipping 29 matching lines @@
                             " child_id_ = " "%d"
                             " request_id_ = " "%d"
                             " Base File = %s"
                             " }",
                             full_path_.value().c_str(),
                             id_,
                             child_id_,
                             request_id_,
                             BaseFile::DebugString().c_str());
 }