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

components/sync/driver/backend_migrator_unittest.cc

Index: components/sync/driver/backend_migrator_unittest.cc
diff --git a/components/sync/driver/backend_migrator_unittest.cc b/components/sync/driver/backend_migrator_unittest.cc
index 9ac09ae173e7314c74d30d0fb4e07a139b31d598..f78d0dc82c16cd67f4ec284c22600dfe54785b47 100644
--- a/components/sync/driver/backend_migrator_unittest.cc
+++ b/components/sync/driver/backend_migrator_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <memory>
 
+#include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/tracked_objects.h"
@@ -39,9 +40,9 @@ class SyncBackendMigratorTest : public testing::Test {
     preferred_types_.Put(PREFERENCES);
     preferred_types_.Put(AUTOFILL);
 
-    migrator_.reset(new BackendMigrator("Profile0",
-                                        test_user_share_.user_share(),
-                                        service(), manager(), base::Closure()));
+    migrator_ = base::MakeUnique<BackendMigrator>(
+        "Profile0", test_user_share_.user_share(), service(), manager(),
+        base::Closure());
     SetUnsyncedTypes(ModelTypeSet());
   }