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to be consistent with the shebang in `run_web_tests.py`

Also `chmod +x` because checkperms complained.

Note that vpython(.bat) is provided by depot_tools and should be
available in PATH after following the Windows build instructions:
https://chromium.googlesource.com/chromium/src.git/+/master/docs/windows_build_instructions.md#install

Bug: 1095643
Change-Id: I0afaae268022e0a2a368ecae6cd7020c453f5812
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2249086
Commit-Queue: Robert Ma <robertma@chromium.org>
Auto-Submit: Robert Ma <robertma@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780792}