Revert of Make telemetry_unittests.py work on Windows (patchset #1 id:1 of...

Revert of Make telemetry_unittests.py work on Windows (patchset #1 id:1 of https://codereview.chromium.org/647103003/)

Reason for revert:
windows trybots broken

please be around after landing changes and verify that bots are working

Original issue's description:
> Make telemetry_unittests.py work on Windows
>
> BUG=422235
> R=bartfab@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/f9f4000b3b94e82f7cf22277c649618f0bb97b66

TBR=bartfab@chromium.org,phajdan.jr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=422235

Review URL: https://codereview.chromium.org/671933002

Cr-Commit-Position: refs/heads/master@{#300685}

testing/scripts/telemetry_unittests.py

@@ -18,7 +18,6 @@ def main_run(args):
 
   with common.temporary_file() as tempfile_path:
     rc = common.run_command([
-        sys.executable,
         os.path.join(args.paths['build'], 'scripts', 'tools', 'runit.py'),
         '--show-path',
         os.path.join(args.paths['build'], 'scripts', 'slave', 'runtest.py'),