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Based on the comment at:
https://bugs.chromium.org/p/chromium/issues/detail?id=862176
This CL makes:
SecurityExploitBrowserTest.InvalidOriginHeaders
ExtensionUnloadBrowserTest.UnloadWithContentScripts
early return if network service is enabled.

Bug: 862176
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: I040ac9615a6deed786825d306a9192d14925a5cc
Reviewed-on: https://chromium-review.googlesource.com/1176479Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Jun Cai <juncai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583455}