This reverts commit 29ec319f.

Reason for revert: Will disable gclient update

Original change's description:
> Revert "[release] Replace raw DEPS processing with gclient getdep"
> 
> This reverts commit 0ba1c23c.
> 
> Reason for revert: Doesn't work yet
> 
> Original change's description:
> > [release] Replace raw DEPS processing with gclient getdep
> > 
> > No-Try: true
> > Bug: chromium:1106435
> > Change-Id: I120d3930e4e8be7010d8d1f1928829ca0882638d
> > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2304578
> > Reviewed-by: Tamer Tas <tmrts@chromium.org>
> > Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#68913}
> 
> TBR=machenbach@chromium.org,tmrts@chromium.org,liviurau@chromium.org
> 
> Change-Id: I76e02bfa50fdc5967ab72784cd71114bb82b7261
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: chromium:1106435
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2304585
> Reviewed-by: Michael Achenbach <machenbach@chromium.org>
> Commit-Queue: Michael Achenbach <machenbach@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#68914}

TBR=machenbach@chromium.org,tmrts@chromium.org,liviurau@chromium.org

Change-Id: I3d6192a18b7bb14ccdcef6483483b1afe4fbb485
No-Try: true
Bug: chromium:1106435
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2304811Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#68923}