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

components/sync/syncable/directory_backing_store.cc

Index: components/sync/syncable/directory_backing_store.cc
diff --git a/components/sync/syncable/directory_backing_store.cc b/components/sync/syncable/directory_backing_store.cc
index dab08717b584143c191059b645b9ca98dfe9eb8e..02b3fd9090cab212ae876d07f41d8bf49ba003e0 100644
--- a/components/sync/syncable/directory_backing_store.cc
+++ b/components/sync/syncable/directory_backing_store.cc
@@ -13,6 +13,7 @@
 #include "base/base64.h"
 #include "base/location.h"
 #include "base/logging.h"
+#include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/rand_util.h"
 #include "base/single_thread_task_runner.h"
@@ -1743,7 +1744,7 @@ bool DirectoryBackingStore::needs_column_refresh() const {
 }
 
 void DirectoryBackingStore::ResetAndCreateConnection() {
-  db_.reset(new sql::Connection());
+  db_ = base::MakeUnique<sql::Connection>();
   db_->set_histogram_tag("SyncDirectory");
   db_->set_exclusive_locking();
   db_->set_cache_size(32);