[Sync] Remove unneeded 'using syncer::' lines and 'syncer::' scopings

sync/notifier/sync_notifier_factory_unittest.cc

Index: sync/notifier/sync_notifier_factory_unittest.cc
diff --git a/sync/notifier/sync_notifier_factory_unittest.cc b/sync/notifier/sync_notifier_factory_unittest.cc
index e11d9cfaa0453e4ffd522423e5ecdb25eb45eee7..52fd50595008c9d2776e9f1cbdbd64b673ebbaf9 100644
--- a/sync/notifier/sync_notifier_factory_unittest.cc
+++ b/sync/notifier/sync_notifier_factory_unittest.cc
@@ -54,7 +54,7 @@ TEST_F(SyncNotifierFactoryTest, Basic) {
   SyncNotifierFactory factory(
       notifier_options_,
       "test client info",
-      base::WeakPtr<syncer::InvalidationStateTracker>());
+      base::WeakPtr<InvalidationStateTracker>());
   scoped_ptr<SyncNotifier> notifier(factory.CreateSyncNotifier());
 #if defined(OS_ANDROID)
   ASSERT_FALSE(notifier.get());
@@ -71,7 +71,7 @@ TEST_F(SyncNotifierFactoryTest, Basic_P2P) {
   SyncNotifierFactory factory(
       notifier_options_,
       "test client info",
-      base::WeakPtr<syncer::InvalidationStateTracker>());
+      base::WeakPtr<InvalidationStateTracker>());
   scoped_ptr<SyncNotifier> notifier(factory.CreateSyncNotifier());
 #if defined(OS_ANDROID)
   ASSERT_FALSE(notifier.get());