sync: Remove IDs from OrderedCommitSet

sync/engine/process_commit_response_command_unittest.cc

Index: sync/engine/process_commit_response_command_unittest.cc
diff --git a/sync/engine/process_commit_response_command_unittest.cc b/sync/engine/process_commit_response_command_unittest.cc
index 1520ca247b54a40ec5aa76dbfd4d9724f03a2996..7f3e369b38d950a634bfc25d5a6fea86d6953f2d 100644
--- a/sync/engine/process_commit_response_command_unittest.cc
+++ b/sync/engine/process_commit_response_command_unittest.cc
@@ -98,7 +98,7 @@ class ProcessCommitResponseCommandTest : public SyncerCommandTest {
 
     // ProcessCommitResponseCommand consumes commit_ids from the session
     // state, so we need to update that.  O(n^2) because it's a test.
-    commit_set->AddCommitItem(metahandle, item_id, model_type);
+    commit_set->AddCommitItem(metahandle, model_type);
 
     WriteTransaction trans(FROM_HERE, UNITTEST, directory());
     MutableEntry entry(&trans, syncable::GET_BY_ID, item_id);