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

sync/syncable/in_memory_directory_backing_store.cc

Index: sync/syncable/in_memory_directory_backing_store.cc
diff --git a/sync/syncable/in_memory_directory_backing_store.cc b/sync/syncable/in_memory_directory_backing_store.cc
index 57995f823789ba15d06cbe2b066a6768dbe7bb18..8f84baa9b536e5aefeddcc9034ba1759345242ff 100644
--- a/sync/syncable/in_memory_directory_backing_store.cc
+++ b/sync/syncable/in_memory_directory_backing_store.cc
@@ -16,6 +16,7 @@ InMemoryDirectoryBackingStore::InMemoryDirectoryBackingStore(
 DirOpenResult InMemoryDirectoryBackingStore::Load(
     Directory::MetahandlesMap* handles_map,
     JournalIndex* delete_journals,
+    MetahandleSet* metahandles_to_purge,
     Directory::KernelLoadInfo* kernel_load_info) {
   if (!db_->is_open()) {
     if (!db_->OpenInMemory())
@@ -32,9 +33,7 @@ DirOpenResult InMemoryDirectoryBackingStore::Load(
     }
   }
 
-  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;