Mark now-passing browsertests on ChromeOS with network service after r593703.

Bug: 887381
Change-Id: I2f0ac7465772e09bf00af224e61ace0a791129fe
Reviewed-on: https://chromium-review.googlesource.com/1241278Reviewed-by: Chong Zhang <chongz@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593734}

testing/buildbot/filters/mojo.fyi.chromeos.network_browser_tests.filter

@@ -72,11 +72,7 @@
 -SAMLPolicyTest.TransferCookiesAffiliated
 -SAMLPolicyTest.TransferCookiesUnaffiliated
 -SamlTest.FailToRetrieveAutenticatedUserEmailAddress
--SamlTest.HTTPRedirectDisallowed
--SamlTest.MetaRefreshToHTTPDisallowed
--SamlTest.NoticeUpdatedOnRedirect
 -SamlTest.PasswordConfirmFlow
--SamlTest.SamlUI
 -SamlTest.ScrapedDynamic
 -SamlTest.ScrapedNone
 -SamlTest.ScrapedSingle