Revert of [Telemetry] Copy run_chromeos_tests.py to chrome/test/telemetry/ (patchset #4 id:50001 of https://codereview.chromium.org/1382083002/ )
Revert of [Telemetry] Copy run_chromeos_tests.py to chrome/test/telemetry/ (patchset #4 id:50001 of https://codereview.chromium.org/1382083002/ )

Reason for revert:
No longer need to remove run_chromeos_tests.py from telemetry, so we don't need this file here.

Original issue's description:
> [Telemetry] Copy run_chromeos_tests.py from telemetry/testing to chrome/test/telemetry/
>
> After the client has update the reference, next patch will completely remove telemetry/testing/run_chromeos_tests.py
>
> BUG=538362
>
> Committed: https://crrev.com/de3029ba3fcc564e4e75d8810d218edd98d6d945
> Cr-Commit-Position: refs/heads/master@{#352038}

TBR=phajdan.jr@chromium.org,achuith@chromium.org,cylee@chromium.org
BUG=538362

Review URL: https://codereview.chromium.org/1372063003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#352224}

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