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This and uses the mojo API for GetNetworkCertificates in the internet
configuration WebUI.

This also removes the last references to networkingPrivate in the
Settings UI!

For minor default value change in .mojom (documentation only since JS
does not get default values):
TBR=dcheng@chromium.org

Bug: 1001598
Change-Id: I190b0aa30111abee05024da4ca3e21523b2a5273
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809852Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699955}