Cleanup: Remove unneeded browser_thread.h includes in contents.

chrome/browser/chromeos/drive/drive_download_observer.cc

 // Copyright (c) 2012 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/chromeos/drive/drive_download_observer.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/supports_user_data.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
 #include "chrome/browser/chromeos/drive/drive_cache.h"
 #include "chrome/browser/chromeos/drive/drive_file_system_interface.h"
 #include "chrome/browser/chromeos/drive/drive_file_system_util.h"
 #include "chrome/browser/chromeos/drive/drive_system_service.h"
 #include "chrome/browser/chromeos/drive/file_write_helper.h"
 #include "chrome/browser/profiles/profile_manager.h"
+#include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 using content::DownloadManager;
 using content::DownloadItem;
 
 namespace drive {
 namespace {
 
 // Key for base::SupportsUserData::Data.
 const char kDrivePathKey[] = "DrivePath";
@@ skipping 222 matching lines @@
   }
 }
 
 void DriveDownloadObserver::UploadDownloadItem(DownloadItem* download) {
   file_write_helper_->PrepareWritableFileAndRun(
       GetDrivePath(download),
       base::Bind(&MoveDownloadedFile, download->GetFullPath()));
 }
 
 }  // namespace drive