Extend a test of namespace imports such that it accesses the object inside a
with statement (inside a sloppy function).

Drive-by-fix: remove duplicate initialization of embedder data (probably due to
bad merge).

R=adamk@chromium.org
BUG=v8:1569

Review-Url: https://codereview.chromium.org/2405603003
Cr-Commit-Position: refs/heads/master@{#40129}