drive: Do not try to UpdateResource with empty resource ID

chrome/browser/chromeos/drive/sync/entry_update_performer.cc

Index: chrome/browser/chromeos/drive/sync/entry_update_performer.cc
diff --git a/chrome/browser/chromeos/drive/sync/entry_update_performer.cc b/chrome/browser/chromeos/drive/sync/entry_update_performer.cc
index d9c4c6d0f178c5bcb05c1b6bb7dbd3acf453f4da..7fa3c9eb7ab9d02c69b32ff042892e72f305bb55 100644
--- a/chrome/browser/chromeos/drive/sync/entry_update_performer.cc
+++ b/chrome/browser/chromeos/drive/sync/entry_update_performer.cc
@@ -323,13 +323,12 @@ void EntryUpdatePerformer::UpdateEntryAfterPrepare(
   }
 
   // No need to perform update.
-  if (local_state->entry.metadata_edit_state() == ResourceEntry::CLEAN) {
+  if (local_state->entry.metadata_edit_state() == ResourceEntry::CLEAN ||
+      local_state->entry.resource_id().empty()) {
     callback.Run(FILE_ERROR_OK);
     return;
   }
 
-  DCHECK(!local_state->entry.resource_id().empty());
-
   // Perform metadata update.
   scheduler_->UpdateResource(
       local_state->entry.resource_id(), local_state->parent_entry.resource_id(),