This reverts commit ff622244.

Reason for revert: spec revert for crbug.com/849374

Original change's description:
> Reland "Expand variables in gclient flattened output."
> 
> This is a reland of a32f98e6
> 
> Original change's description:
> > Expand variables in gclient flattened output.
> >
> > Bug: 848990
> > Change-Id: I0ad7e4f965973edbc5a335bd30f9cbd7b04abff2
> > Reviewed-on: https://chromium-review.googlesource.com/1085996
> > Reviewed-by: Michael Moss <mmoss@chromium.org>
> > Reviewed-by: Aaron Gable <agable@chromium.org>
> > Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
> 
> Tbr: agable@chromium.org
> Bug: 848990
> Change-Id: I7843544b79b2ab7e2046c187d13ea3eb65fc1b7d
> Reviewed-on: https://chromium-review.googlesource.com/1085975
> Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
> Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>

TBR=agable@chromium.org,mmoss@chromium.org,ehmaldonado@chromium.org

Change-Id: I89ffb80893be72f60043e8a6e02f6c0fb6fe5cc1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 848990
Reviewed-on: https://chromium-review.googlesource.com/1086747Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Budorick <jbudorick@chromium.org>