[sync] Componentize sync: Part Final: Target 'sync' is now its own component

sync/syncable/syncable_base_transaction.cc

Index: sync/syncable/syncable_base_transaction.cc
diff --git a/sync/syncable/syncable_base_transaction.cc b/sync/syncable/syncable_base_transaction.cc
index 0404d9446707aad6f3ab5ad3304107865ceceb4d..d068bb9399a688c1c42825dbce8a0bb84a9976d2 100644
--- a/sync/syncable/syncable_base_transaction.cc
+++ b/sync/syncable/syncable_base_transaction.cc
@@ -10,6 +10,14 @@
 namespace syncer {
 namespace syncable {
 
+Directory* BaseTransaction::directory() const {
+  return directory_;
+}
+
+Id BaseTransaction::root_id() const {
+  return Id();
+}
+
 void BaseTransaction::Lock() {
   TRACE_EVENT2("sync_lock_contention", "AcquireLock",
                "src_file", from_here_.file_name(),