[Sync] Rewriting ".reset(new" pattern to use "= base::MakeUnique" instead.

components/sync/engine_impl/attachments/attachment_downloader_impl.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 "components/sync/engine_impl/attachments/attachment_downloader_impl.h"
 
 #include <utility>
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/location.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/single_thread_task_runner.h"
 #include "base/sys_byteorder.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "components/sync/engine/attachments/attachment_util.h"
 #include "components/sync/engine_impl/attachments/attachment_uploader_impl.h"
 #include "components/sync/protocol/sync.pb.h"
@@ skipping 210 matching lines @@
 
 void AttachmentDownloaderImpl::ReportResult(
     const DownloadState& download_state,
     const DownloadResult& result,
     const scoped_refptr<base::RefCountedString>& attachment_data) {
   std::vector<DownloadCallback>::const_iterator iter;
   for (iter = download_state.user_callbacks.begin();
        iter != download_state.user_callbacks.end(); ++iter) {
     std::unique_ptr<Attachment> attachment;
     if (result == DOWNLOAD_SUCCESS) {
-      attachment.reset(new Attachment(Attachment::CreateFromParts(
-          download_state.attachment_id, attachment_data)));
+      attachment = base::MakeUnique<Attachment>(Attachment::CreateFromParts(
+          download_state.attachment_id, attachment_data));
     }
 
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE, base::Bind(*iter, result, base::Passed(&attachment)));
   }
 }
 
 bool AttachmentDownloaderImpl::ExtractCrc32c(
     const net::HttpResponseHeaders* headers,
     uint32_t* crc32c) {
@@ skipping 28 matching lines @@
 
   if (crc32c_raw.size() != sizeof(*crc32c))
     return false;
 
   *crc32c =
       base::NetToHost32(*reinterpret_cast<const uint32_t*>(crc32c_raw.c_str()));
   return true;
 }
 
 }  // namespace syncer