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This reverts commit d6407546.

Reason for revert: broke all builders at gclient runhook

Original change's description:
> infra/config Use Goma's task service account.
> 
> For ease of distinguishing Goma's builder, let me specify special
> service accounts for them.
> 
> Bug: b/166712857
> Change-Id: I45317d787e2b3f8bbf9e1cb15d588ba661fad4fe
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384450
> Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
> Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> Auto-Submit: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
> Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#802998}

TBR=ukai@google.com,yyanagisawa@chromium.org,tikuta@chromium.org,yekuang@google.com

Change-Id: I5e9bf7044ca1e9a23455e89e99533a42cb18883c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/166712857
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2384573Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803020}