sync: Loop committing items without downloading updates

sync/sessions/ordered_commit_set.cc

Index: sync/sessions/ordered_commit_set.cc
diff --git a/sync/sessions/ordered_commit_set.cc b/sync/sessions/ordered_commit_set.cc
index 51a354eb19e31813b2e6767be5107483c76d1489..a8129caccbe5f16a4c3d0ae99b35953b279fdb29 100644
--- a/sync/sessions/ordered_commit_set.cc
+++ b/sync/sessions/ordered_commit_set.cc
@@ -32,7 +32,7 @@ void OrderedCommitSet::AddCommitItem(const int64 metahandle,
 }
 
 void OrderedCommitSet::Append(const OrderedCommitSet& other) {
-  for (int i = 0; i < other.Size(); ++i) {
+  for (size_t i = 0; i < other.Size(); ++i) {
     CommitItem item = other.GetCommitItemAt(i);
     AddCommitItem(item.meta, item.id, item.group);
   }
@@ -72,7 +72,7 @@ void OrderedCommitSet::Truncate(size_t max_size) {
 }
 
 OrderedCommitSet::CommitItem OrderedCommitSet::GetCommitItemAt(
-    const int position) const {
+    const size_t position) const {
   DCHECK(position < Size());
   CommitItem return_item = {metahandle_order_[position],
       commit_ids_[position],