This is a reland of commit 6817010e

Additional Changes:
This reland fixes https://crbug.com/1330995 by stopping gclient from accidentally updating the scheme when one is not present.

Original change's description:
> Update fetch protocol using --protocol-override flag
>
> This CL updates gclient sync to use the protocol of the URL specified in the solutions for cloning all the child dependencies of it.
>
> Bug: chrome-operations:170
> Change-Id: I33588059788b677fbae8c3b434100af5c7979a67
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3631600
> Reviewed-by: Joanna Wang <jojwang@chromium.org>
> Reviewed-by: Josip Sokcevic <sokcevic@google.com>
> Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>

Bug: 1330995
Change-Id: I1447a5e884e41d671d8556c35193f1635f2f6936
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3684112Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Reviewed-by: Joanna Wang <jojwang@chromium.org>
Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>