Network config: Always show 'Allow shared' toggle for shared networks

The proxy config code is absurdly complicated. It turns out we can
not currently differentiate between scenarios where
'allow shared proxies' is applied and when it is not.

We should address this in crbug.com/662529, but for now we should
always show the toggle for shared networks.

Bug: 798553
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I75439910eeeab62dc9d0857ee2fd6246a0f6eeba
Reviewed-on: https://chromium-review.googlesource.com/912691
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536212}
2 files changed