Move more dnd related files to ui/base

chrome/browser/download/drag_download_file.cc

 // Copyright (c) 2009-2010 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_file.h"
 
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "chrome/browser/browser_thread.h"
 #include "chrome/browser/download/download_file.h"
@@ skipping 39 matching lines @@
     if (!file_path_.empty())
       file_util::DeleteAfterReboot(file_path_);
     file_util::DeleteAfterReboot(temp_dir_path_);
   }
 #endif
 
   if (download_manager_)
     download_manager_->RemoveObserver(this);
 }
 
-bool DragDownloadFile::Start(DownloadFileObserver* observer) {
+bool DragDownloadFile::Start(ui::DownloadFileObserver* observer) {
   AssertCurrentlyOnDragThread();
 
   if (is_started_)
     return true;
   is_started_ = true;
 
   DCHECK(!observer_.get());
   observer_ = observer;
 
   if (!file_stream_.get()) {
@@ skipping 139 matching lines @@
 
 void DragDownloadFile::QuitNestedMessageLoop() {
   AssertCurrentlyOnDragThread();
 
   if (is_running_nested_message_loop_) {
     is_running_nested_message_loop_ = false;
     MessageLoop::current()->Quit();
   }
 }
 #endif