[Sync] Rely on directory to decide which types need to be purged

sync/syncable/directory_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "sync/syncable/directory_unittest.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/test/values_test_util.h"
 #include "sync/internal_api/public/base/attachment_id_proto.h"
 #include "sync/syncable/syncable_proto_util.h"
@@ skipping 214 matching lines @@
   ASSERT_TRUE(base_version == e.GetBaseVersion());
   ASSERT_TRUE(server_version == e.GetServerVersion());
   ASSERT_TRUE(is_del == e.GetIsDel());
 }
 
 TEST_F(SyncableDirectoryTest, TakeSnapshotGetsMetahandlesToPurge) {
   const int metas_to_create = 50;
   MetahandleSet expected_purges;
   MetahandleSet all_handles;
   {
+    dir()->SetDownloadProgress(BOOKMARKS, BuildProgress(BOOKMARKS));
+    dir()->SetDownloadProgress(PREFERENCES, BuildProgress(PREFERENCES));
     WriteTransaction trans(FROM_HERE, UNITTEST, dir().get());
     for (int i = 0; i < metas_to_create; i++) {
       MutableEntry e(&trans, CREATE, BOOKMARKS, trans.root_id(), "foo");
       e.PutIsUnsynced(true);
       sync_pb::EntitySpecifics specs;
       if (i % 2 == 0) {
         AddDefaultFieldValue(BOOKMARKS, &specs);
         expected_purges.insert(e.GetMetahandle());
         all_handles.insert(e.GetMetahandle());
       } else {
@@ skipping 1469 matching lines @@
   // Delete the second entry, reload the Directory, see that the attachment is
   // no loner linked.
   DeleteEntry(id2);
   SimulateSaveAndReloadDir();
   ASSERT_FALSE(dir()->IsAttachmentLinked(attachment_id_proto));
 }
 
 }  // namespace syncable
 
 }  // namespace syncer