Cleanup: Pass std::string as const reference if possible

sync/internal_api/public/test/sync_manager_factory_for_profile_sync_test.h

Index: sync/internal_api/public/test/sync_manager_factory_for_profile_sync_test.h
diff --git a/sync/internal_api/public/test/sync_manager_factory_for_profile_sync_test.h b/sync/internal_api/public/test/sync_manager_factory_for_profile_sync_test.h
index 695d07e73dee5549ec7543b81ee492d175717371..8eb053f2ae79c58ae1523dab3f24ba3599bfb3f5 100644
--- a/sync/internal_api/public/test/sync_manager_factory_for_profile_sync_test.h
+++ b/sync/internal_api/public/test/sync_manager_factory_for_profile_sync_test.h
@@ -17,7 +17,8 @@ class SyncManagerFactoryForProfileSyncTest : public syncer::SyncManagerFactory {
  public:
   SyncManagerFactoryForProfileSyncTest(base::Closure init_callback);
   ~SyncManagerFactoryForProfileSyncTest() override;
-  scoped_ptr<syncer::SyncManager> CreateSyncManager(std::string name) override;
+  scoped_ptr<syncer::SyncManager> CreateSyncManager(
+      const std::string& name) override;
 
  private:
   base::Closure init_callback_;