crrev.com/c/1097623 broke the official bots because the cipd variable
escaping present in the normal DEPS file wasn't present in the flattened
DEPS file.

Change-Id: Iaae8b95a9d8c5ce0ed80071169e731a24e98b4c4
Reviewed-on: https://chromium-review.googlesource.com/1112935
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: Edward Lesmes <ehmaldonado@chromium.org>
Reviewed-by: Aaron Gable <agable@chromium.org>