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This reverts commit ccb9f3bf.
I noticed I need to update other GCS permission to allow
the task service account to run gclient sync.

Bug: b/166712857
Change-Id: I4e534eb1bb1a026de169b2c0b58e9bd50b354b26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398070Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Commit-Queue: Yoshisato Yanagisawa <yyanagisawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805166}