[Sync] Move ModelType and related classes to 'syncer' namespace

sync/engine/download_updates_command.cc

Index: sync/engine/download_updates_command.cc
diff --git a/sync/engine/download_updates_command.cc b/sync/engine/download_updates_command.cc
index a6bc972b763126df4a94f61c7cb39271d05231a2..48e4acfebefde24711dfb5bad924dc10b7e6d80f 100644
--- a/sync/engine/download_updates_command.cc
+++ b/sync/engine/download_updates_command.cc
@@ -19,10 +19,6 @@ namespace syncer {
 using sessions::StatusController;
 using sessions::SyncSession;
 using std::string;
-using syncable::FIRST_REAL_MODEL_TYPE;
-using syncable::MODEL_TYPE_COUNT;
-using syncable::ModelTypeSet;
-using syncable::ModelTypeSetToString;
 
 DownloadUpdatesCommand::DownloadUpdatesCommand(
     bool create_mobile_bookmarks_folder)
@@ -51,7 +47,7 @@ SyncerError DownloadUpdatesCommand::ExecuteImpl(SyncSession* session) {
            << ModelTypeSetToString(enabled_types);
   DCHECK(!enabled_types.Empty());
 
-  const syncable::ModelTypePayloadMap& type_payload_map =
+  const syncer::ModelTypePayloadMap& type_payload_map =
       session->source().types;
   for (ModelTypeSet::Iterator it = enabled_types.First();
        it.Good(); it.Inc()) {
@@ -60,7 +56,7 @@ SyncerError DownloadUpdatesCommand::ExecuteImpl(SyncSession* session) {
     dir->GetDownloadProgress(it.Get(), progress_marker);
 
     // Set notification hint if present.
-    syncable::ModelTypePayloadMap::const_iterator type_payload =
+    syncer::ModelTypePayloadMap::const_iterator type_payload =
         type_payload_map.find(it.Get());
     if (type_payload != type_payload_map.end()) {
       progress_marker->set_notification_hint(type_payload->second);