Revert of Optimization: Make clean-up of DeviceTempFile() async (patchset #2 id:20001 of https://codereview.chromium.org/1283323008/ )
Revert of Optimization: Make clean-up of DeviceTempFile() async (patchset #2 id:20001 of https://codereview.chromium.org/1283323008/ )

Reason for revert:
Needed to revert https://codereview.chromium.org/1285263009/

Original issue's description:
> Optimization: Make clean-up of DeviceTempFile() async
>
> Brings the no-op case of managed_install.py from 9s -> 8.5s
> chrome_modern_with_splits_managed when adb is forwarded over ssh.
>
> Uses threading, but since DeviceTempFile() uses adb_wrapper rather than
> device_utils, there is no state being mutated by the call.
>
> BUG=520082
>
> Committed: https://crrev.com/aa882dfb8b79bcb2141db62c552063a4b38e823d
> Cr-Commit-Position: refs/heads/master@{#345137}

TBR=jbudorick@chromium.org,agrieve@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=520082

Review URL: https://codereview.chromium.org/1307273003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#345165}

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