We'll automatically figure out that we can't parse an expression at the EOS
anyway.

Change-Id: I663e3b9d030ee048b28472710071778bfc511747
Reviewed-on: https://chromium-review.googlesource.com/c/1286681Reviewed-by: Sathya Gunasekaran <gsathya@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56755}