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

sync/internal_api/public/test/test_entry_factory.h

Index: sync/internal_api/public/test/test_entry_factory.h
diff --git a/sync/internal_api/public/test/test_entry_factory.h b/sync/internal_api/public/test/test_entry_factory.h
index bb96f2f7be36fa7022c50edd87beea19e823595e..6f794d57b2d28437f608085a65edaf6ce5f8b510 100644
--- a/sync/internal_api/public/test/test_entry_factory.h
+++ b/sync/internal_api/public/test/test_entry_factory.h
@@ -11,13 +11,13 @@
 #include "sync/internal_api/public/syncable/model_type.h"
 #include "sync/protocol/sync.pb.h"
 
+namespace syncer {
+
 namespace syncable {
 class Directory;
 class Id;
 }
 
-namespace syncer {
-
 class TestEntryFactory {
  public:
   explicit TestEntryFactory(syncable::Directory* dir);