This reverts commit cc27ecb0.

Reason for revert: Published this method downstream to internal repo.

Original change's description:
> Revert "[tryserver] Remove unused methods."
> 
> This reverts commit 133ac1ab.
> 
> Reason for revert: Turns out these are used by internal recipes.
> 
> Original change's description:
> > [tryserver] Remove unused methods.
> > 
> > R=​agable@chromium.org, dnj@chromium.org, hinoka@chromium.org
> > 
> > Bug:
> > Change-Id: I82a11f31c8c1c4c4a2b461090e5aee637f8821c2
> > Reviewed-on: https://chromium-review.googlesource.com/569019
> > Reviewed-by: Nodir Turakulov <nodir@chromium.org>
> > Reviewed-by: Aaron Gable <agable@chromium.org>
> > Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
> 
> TBR=iannucci@chromium.org,hinoka@chromium.org,agable@chromium.org,dnj@chromium.org,nodir@chromium.org
> 
> Change-Id: Ib1d4192520a36f649f1f9b31e2928027667311d4
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/570988
> Reviewed-by: Daniel Jacques <dnj@chromium.org>
> Commit-Queue: Daniel Jacques <dnj@chromium.org>

TBR=iannucci@chromium.org,hinoka@chromium.org,agable@chromium.org,dnj@chromium.org,nodir@chromium.org

Change-Id: Id7ac3555d40162e4204ceac5e96c2e3864c67aba
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/570781Reviewed-by: Daniel Jacques <dnj@chromium.org>
Commit-Queue: Daniel Jacques <dnj@chromium.org>