[ast] Minor cleanup in scopes.cc.
- Remove TODO concerning maybe-assigned. For LOOKUP variables, the flag doesn't really matter, so let's just set it to true to avoid confusion. - Simplify a condition. R=adamk@chromium.org BUG= Review-Url: https://codereview.chromium.org/2677653003 Cr-Commit-Position: refs/heads/master@{#42947}
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