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This is not used anymore.
https://source.chromium.org/search?q=%22--auth-service-account-json%22%20f:recipe

Bug: 1127205
Change-Id: Ia6cb9dc263a238073ac988210c99079c173f0f18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2642656
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845721}