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

components/sync/driver/glue/sync_backend_host_impl.cc

Index: components/sync/driver/glue/sync_backend_host_impl.cc
diff --git a/components/sync/driver/glue/sync_backend_host_impl.cc b/components/sync/driver/glue/sync_backend_host_impl.cc
index 072c5f616bd9cf7c4c63cb3427f63ed05e7a7110..3c8f4f69ac2e5ad0a93174a821d5870d78a91fc4 100644
--- a/components/sync/driver/glue/sync_backend_host_impl.cc
+++ b/components/sync/driver/glue/sync_backend_host_impl.cc
@@ -10,6 +10,7 @@
 #include "base/feature_list.h"
 #include "base/location.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/invalidation/public/invalidation_service.h"
 #include "components/invalidation/public/object_id_invalidation_map.h"
@@ -83,9 +84,9 @@ void SyncBackendHostImpl::Initialize(
     const base::Closure& report_unrecoverable_error_function,
     const HttpPostProviderFactoryGetter& http_post_provider_factory_getter,
     std::unique_ptr<SyncEncryptionHandler::NigoriState> saved_nigori_state) {
-  registrar_.reset(new SyncBackendRegistrar(name_, sync_client_,
-                                            std::move(sync_thread), ui_thread_,
-                                            db_thread, file_thread));
+  registrar_ = base::MakeUnique<SyncBackendRegistrar>(
+      name_, sync_client_, std::move(sync_thread), ui_thread_, db_thread,
+      file_thread);
   CHECK(registrar_->sync_thread());
 
   frontend_ = frontend;