Revert of Keep track of which attachments are referenced by which sync entries.

sync/engine/get_commit_ids.cc

Index: sync/engine/get_commit_ids.cc
diff --git a/sync/engine/get_commit_ids.cc b/sync/engine/get_commit_ids.cc
index 5f91915d5a0720e018ea333938e1329727c85cc4..80222ee20dd625d7efe108195695224d0c5569a6 100644
--- a/sync/engine/get_commit_ids.cc
+++ b/sync/engine/get_commit_ids.cc
@@ -108,13 +108,9 @@
 // Return true if this entry has any attachments that haven't yet been uploaded
 // to the server.
 bool HasAttachmentNotOnServer(const syncable::Entry& entry) {
-  // TODO(maniscalco): Add test case (bug 356266).
-  const sync_pb::AttachmentMetadata& metadata = entry.GetAttachmentMetadata();
-  for (int i = 0; i < metadata.record_size(); ++i) {
-    if (!metadata.record(i).is_on_server()) {
-      return true;
-    }
-  }
+  // TODO(maniscalco): Once AttachmentMetadata is fleshed out, implement this
+  // function to return true if any of the attachments haven't been uploaded to
+  // the server. Add test case (bug 356266).
   return false;
 }