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Rather than Env::GetInstance(). This ensures the right instance is used.

BUG=847992
TEST=covered by tests

Change-Id: I9b75458c1e4d21402ef2e58833c57ff9a289b7a0
Reviewed-on: https://chromium-review.googlesource.com/1176062Reviewed-by: Michael Wasserman <msw@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583296}