Since we only support Var, and Var only does one thing, we hard code that
into the parser. Then, we don't need global_scope.

local_scope hasn't been needed for a while.

Bug: 760633
Change-Id: I21b171a8b71e7dcaf8e29c780ca88b9f46f368e8
Reviewed-on: https://chromium-review.googlesource.com/972611Reviewed-by: Aaron Gable <agable@chromium.org>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>