[Sync] Move sync/{internal_api,syncable} into syncer namespace

sync/test/engine/test_directory_setter_upper.cc

Index: sync/test/engine/test_directory_setter_upper.cc
diff --git a/sync/test/engine/test_directory_setter_upper.cc b/sync/test/engine/test_directory_setter_upper.cc
index 557e9500ce702b279dec602f554898c651274b4c..1a683897c53b06ca32c7635c4a712b4aacb20433 100644
--- a/sync/test/engine/test_directory_setter_upper.cc
+++ b/sync/test/engine/test_directory_setter_upper.cc
@@ -14,11 +14,10 @@
 #include "sync/test/null_transaction_observer.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using syncable::NullTransactionObserver;
-using syncable::ReadTransaction;
-
 namespace syncer {
 
+using syncable::NullTransactionObserver;
+
 TestDirectorySetterUpper::TestDirectorySetterUpper() : name_("Test") {}
 
 TestDirectorySetterUpper::~TestDirectorySetterUpper() {}