Revert of Make `git cl description` work for Gerrit (patchset #2 id:20001 of https://codereview.chromium.org/1917473002/ )

Reason for revert:
Broke presubmit

Original issue's description:
> Make `git cl description` work for Gerrit
> 
> This works in that it actually changes the description, but after
> multiple changes, there's multiple footers added. I'm not sure if they
> should be stripped in setting the description? Or is the problem in
> FetchDescription() where it shouldn't be returning
> 'commit_with_footers', but rather something else?
> 
> Example change at https://chromium-review.googlesource.com/c/340430/.
> 
> R=tandrii@chromium.org
> BUG=603207
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=300169

TBR=tandrii@chromium.org,scottmg@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=603207

Review URL: https://codereview.chromium.org/1922733002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@300175 0039d316-1c4b-4281-b951-d872f2087c98