This reverts commit 28a5d5de.

Reason for revert: breaks assumption in function for adding footers

Original change's description:
> Relax git_footers parsing to match that of Gerrit (JGit).
> 
> R=​agable@chromium.org
> 
> Bug: 717504
> Change-Id: Ieb6415d55e85b91f11f9052b0fd08cf982b64d51
> Reviewed-on: https://chromium-review.googlesource.com/501849
> Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
> Reviewed-by: Aaron Gable <agable@chromium.org>
> 

TBR=agable@chromium.org,machenbach@chromium.org,tandrii@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
Bug: 717504

Change-Id: I9b4d619b2972be8434aff9464f1959fbcb3abd32
Reviewed-on: https://chromium-review.googlesource.com/503030Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>