[Cleanup] Used scoped pointers in KeyedServiceFactory's SetTestingFactory functions.

extensions/browser/api/storage/storage_frontend_unittest.cc

Index: extensions/browser/api/storage/storage_frontend_unittest.cc
diff --git a/extensions/browser/api/storage/storage_frontend_unittest.cc b/extensions/browser/api/storage/storage_frontend_unittest.cc
index b292244d0f012c31af9dfc7146749822dae3956c..75982ea826764b95199e0d1268cc95a054641243 100644
--- a/extensions/browser/api/storage/storage_frontend_unittest.cc
+++ b/extensions/browser/api/storage/storage_frontend_unittest.cc
@@ -60,8 +60,8 @@ class ExtensionSettingsFrontendTest : public ExtensionsTest {
  protected:
   void ResetFrontend() {
     storage_factory_->Reset(new LeveldbSettingsStorageFactory());
-    frontend_.reset(
-        StorageFrontend::CreateForTesting(storage_factory_, browser_context()));
+    frontend_ = StorageFrontend::CreateForTesting(storage_factory_,
+                                                  browser_context()).Pass();
   }
 
   base::ScopedTempDir temp_dir_;