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

chrome/browser/download/drag_download_util.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/drag_download_util.h"
 
 #include "base/string_util.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/scoped_ptr.h"
 #include "base/task.h"
 #include "base/string_number_conversions.h"
 #include "base/utf_string_conversions.h"
-#include "chrome/browser/browser_thread.h"
+#include "content/browser/browser_thread.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/file_stream.h"
 #include "net/base/net_errors.h"
 
 using net::FileStream;
 
 namespace drag_download_util {
 
 bool ParseDownloadMetadata(const string16& metadata,
                            string16* mime_type,
@@ skipping 79 matching lines @@
       NewRunnableMethod(this, &PromiseFileFinalizer::Cleanup));
 }
 
 void PromiseFileFinalizer::OnDownloadAborted() {
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(this, &PromiseFileFinalizer::Cleanup));
 }
 
 }  // namespace drag_download_util