Settings WebUI: Remove unnecessary iron-input dependency from network-proxy.

Side benefit: This reduces ChromeOS JS bundle size (crisper.js pre-gzip) from
664kb to 660k (still too big though).

Bug: 899982
Change-Id: I797ae23a158ffa6c01a175f3ff2e739001a0d82a
Reviewed-on: https://chromium-review.googlesource.com/c/1381378
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#617568}
1 file changed