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This reverts commit e2c7dc67.

This relands the below change after fixes to the underlying components
to support unoptimized builds.

cr_components/network: Convert NetworkListItem to Polymer 3.

Also convert the types in NetworkListTypes as well since they are
trivial and NetworkListItem depends on them.

Bug: 1045266
Test: NetworkNetworkListItem*
Change-Id: Ic607a49efa874fde2bf18459dc9a351db6fd49f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364815Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799837}