Sync: Avoid 3 passes over SyncDarta DB when loading the directory from the disk

sync/test/test_directory_backing_store.cc

Index: sync/test/test_directory_backing_store.cc
diff --git a/sync/test/test_directory_backing_store.cc b/sync/test/test_directory_backing_store.cc
index 6a16a0661a62c2030d5c4c9be38956819fe6d95f..f382cc568ddfc286c557358241f2d7732195d458 100644
--- a/sync/test/test_directory_backing_store.cc
+++ b/sync/test/test_directory_backing_store.cc
@@ -24,15 +24,14 @@ TestDirectoryBackingStore::~TestDirectoryBackingStore() {
 DirOpenResult TestDirectoryBackingStore::Load(
     Directory::MetahandlesMap* handles_map,
     JournalIndex* delete_journals,
+    MetahandleSet* metahandles_to_purge,
     Directory::KernelLoadInfo* kernel_load_info) {
   DCHECK(db_->is_open());
 
   if (!InitializeTables())
     return FAILED_OPEN_DATABASE;
 
-  if (!DropDeletedEntries())
-    return FAILED_DATABASE_CORRUPT;
-  if (!LoadEntries(handles_map))
+  if (!LoadEntries(handles_map, metahandles_to_purge))
     return FAILED_DATABASE_CORRUPT;
   if (!LoadDeleteJournals(delete_journals))
     return FAILED_DATABASE_CORRUPT;
@@ -44,5 +43,10 @@ DirOpenResult TestDirectoryBackingStore::Load(
   return OPENED;
 }
 
+bool TestDirectoryBackingStore::DeleteEntries(const MetahandleSet& handles) {
+  return DirectoryBackingStore::DeleteEntries(
+      DirectoryBackingStore::METAS_TABLE, handles);
+}
+
 }  // namespace syncable
 }  // namespace syncer