[Sync] Rename csync namespace to syncer

sync/internal_api/change_reorder_buffer.cc

Index: sync/internal_api/change_reorder_buffer.cc
diff --git a/sync/internal_api/change_reorder_buffer.cc b/sync/internal_api/change_reorder_buffer.cc
index 84619aab1f5db0c8447663d76234b1db8e499708..786fd464d0b145d3aa2d0c783d2e99bf648630a6 100644
--- a/sync/internal_api/change_reorder_buffer.cc
+++ b/sync/internal_api/change_reorder_buffer.cc
@@ -20,7 +20,7 @@ using std::pair;
 using std::queue;
 using std::set;
 
-namespace csync {
+namespace syncer {
 
 // Traversal provides a way to collect a set of nodes from the syncable
 // directory structure and then traverse them, along with any intermediate
@@ -226,4 +226,4 @@ bool ChangeReorderBuffer::GetAllChangesInTreeOrder(
   return true;
 }
 
-}  // namespace csync
+}  // namespace syncer