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This CL adds x-frame-options headers support for network service. It is
similar to what ChromeResourceDispatcherHostDelegate::OnResponseStarted()
does which is for the case when network service is not enabled.

Bug: 852877
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I0a66d6c4f8e91ee05baa00e918480653653b635b
Reviewed-on: https://chromium-review.googlesource.com/1157524Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Commit-Queue: Jun Cai <juncai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581975}