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This reverts commit ead9dd18.

Reason for revert: The added builder doesn't work

Original change's description:
> add 'linux-rel-swarming' builder using chromium-swarm-staging
> 
> This adds copy of
> https://luci-milo-dev.appspot.com/p/chromium/builders/ci/linux-rel-swarming
> but use chromium-swarm-staging.appspot.com.
> 
> I don't have confidence whether this builder runs correctly at first,
> but let me try to see what happens.
> 
> Bug: b/144318226
> Change-Id: I3fba44f82619e6303fa2685063658eafbcbdf3b7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1989300
> Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
> Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
> Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#745826}

TBR=maruel@chromium.org,yyanagisawa@google.com,yyanagisawa@chromium.org,tikuta@chromium.org,jwata@google.com

Change-Id: I54ecad5adecb7283e309458a4edad4996bee7250
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/144318226
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083733Reviewed-by: Garrett Beaty <gbeaty@chromium.org>
Commit-Queue: Garrett Beaty <gbeaty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746046}