Revert "window-service: makes objects using Env take Env (or get from WindowService)"

This reverts commit 04308f3df2ca0d062114eb938691e59137660775.

Reason for revert: Patch earlier in the chain caused failures on msan bot.

Original change's description:
> window-service: makes objects using Env take Env (or get from WindowService)
> 
> This allows for multiple Envs at the same time.
> 
> BUG=847992
> TEST=covered by tests
> 
> Change-Id: I20dda0f7e3fde50027c9c867562718e49152d238
> Reviewed-on: https://chromium-review.googlesource.com/1167654
> Reviewed-by: Michael Wasserman <msw@chromium.org>
> Commit-Queue: Scott Violet <sky@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#581701}

TBR=sky@chromium.org,msw@chromium.org

Change-Id: If149ac9dc90f0ef6cec5e59f744cd0c3189d01e6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 847992
Reviewed-on: https://chromium-review.googlesource.com/1168402
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581715}
10 files changed