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

sync/syncable/directory_backing_store_unittest.cc

Index: sync/syncable/directory_backing_store_unittest.cc
diff --git a/sync/syncable/directory_backing_store_unittest.cc b/sync/syncable/directory_backing_store_unittest.cc
index aefdc43a93a65fb38c0fe7153d1abb51c1681010..1728da0a0a3bf4c9ac5985a4ae4eeeb4198182b6 100644
--- a/sync/syncable/directory_backing_store_unittest.cc
+++ b/sync/syncable/directory_backing_store_unittest.cc
@@ -1952,25 +1952,25 @@ TEST_P(MigrationTest, ToCurrentVersion) {
 
   // Check download_progress state (v75 migration)
   ASSERT_EQ(694,
-      dir_info.kernel_info.download_progress[syncable::BOOKMARKS]
+      dir_info.kernel_info.download_progress[syncer::BOOKMARKS]
       .timestamp_token_for_migration());
   ASSERT_FALSE(
-      dir_info.kernel_info.download_progress[syncable::BOOKMARKS]
+      dir_info.kernel_info.download_progress[syncer::BOOKMARKS]
       .has_token());
   ASSERT_EQ(32904,
-      dir_info.kernel_info.download_progress[syncable::BOOKMARKS]
+      dir_info.kernel_info.download_progress[syncer::BOOKMARKS]
       .data_type_id());
   ASSERT_FALSE(
-      dir_info.kernel_info.download_progress[syncable::THEMES]
+      dir_info.kernel_info.download_progress[syncer::THEMES]
       .has_timestamp_token_for_migration());
   ASSERT_TRUE(
-      dir_info.kernel_info.download_progress[syncable::THEMES]
+      dir_info.kernel_info.download_progress[syncer::THEMES]
       .has_token());
   ASSERT_TRUE(
-      dir_info.kernel_info.download_progress[syncable::THEMES]
+      dir_info.kernel_info.download_progress[syncer::THEMES]
       .token().empty());
   ASSERT_EQ(41210,
-      dir_info.kernel_info.download_progress[syncable::THEMES]
+      dir_info.kernel_info.download_progress[syncer::THEMES]
       .data_type_id());
 
   // Check metas