Revert "Switch webview bots to google devices."

This reverts commit 621bb15ad1dbd50f6088becff0f57c51d0999825.

Reason for revert: Causing test failures.

Original change's description:
> Switch webview bots to google devices.
> 
> Bug: 814405
> Change-Id: I217f731c39f9ad0576ce98236c7c7dc78cf71dd4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592874
> Commit-Queue: Andrew Luo <aluo@chromium.org>
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#663371}

TBR=bpastene@chromium.org,jbudorick@chromium.org,aluo@chromium.org

Change-Id: Id6dc44aa24c8cd9671a5b3a2e26710838ef6fe20
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 814405
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1629919
Reviewed-by: Andrew Luo <aluo@chromium.org>
Commit-Queue: Andrew Luo <aluo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#663391}
4 files changed