Convert //sync from scoped_ptr to std::unique_ptr

sync/internal_api/attachments/fake_attachment_downloader_unittest.cc

 // Copyright 2014 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 "sync/internal_api/public/attachments/fake_attachment_downloader.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 24 matching lines @@
     return download_results_;
   }
 
   void RunMessageLoop() {
     base::RunLoop run_loop;
     run_loop.RunUntilIdle();
   }
 
  private:
   void DownloadDone(const AttachmentDownloader::DownloadResult& result,
-                    scoped_ptr<Attachment> attachment) {
+                    std::unique_ptr<Attachment> attachment) {
     download_results_.push_back(result);
   }
 
   base::MessageLoop message_loop_;
   FakeAttachmentDownloader attachment_downloader_;
   std::vector<AttachmentDownloader::DownloadResult> download_results_;
 };
 
 TEST_F(FakeAttachmentDownloaderTest, DownloadAttachment) {
   AttachmentId attachment_id = AttachmentId::Create(0, 0);
   downloader()->DownloadAttachment(attachment_id, download_callback());
   RunMessageLoop();
   EXPECT_EQ(1U, download_results().size());
   EXPECT_EQ(AttachmentDownloader::DOWNLOAD_SUCCESS, download_results()[0]);
 }
 
 }  // namespace syncer