Clarify and duplicate the comments about network service filters.

Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: Ice8a52e161cf99193ed341573e7a5d035c7e1c96
Reviewed-on: https://chromium-review.googlesource.com/1035082Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554779}

testing/buildbot/filters/OWNERS

 *
 per-file fuchsia*=file://build/fuchsia/OWNERS
 
+# For changes to:
+#   mojo.fyi.network_browser_tests.filter
+#   mojo.fyi.network_content_browsertests.filter
+# If adding an exclusion for an existing failure (e.g. additional test for
+# feature X that is already not working), please add it beside the existing
+# failures. Otherwise please reach out to network-service-dev@.
+
 # TEAM: infra-dev@chromium.org
 # COMPONENT: Infra>Client>Chrome

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

+# NOTE: if adding an exclusion for an existing failure (e.g. additional test for
+# feature X that is already not working), please add it beside the existing
+# failures. Otherwise please reach out to network-service-dev@.
+
 # These tests currently fail when run with --enable-features=NetworkService
 # See https://crbug.com/769401
 
@@ -271,4 +275,6 @@
 -CertificateTransparencyBrowserTest.ProfileRequest
 -CertificateTransparencyBrowserTest.SystemRequest
 
-# NOTE: before adding new exclusions, please reach out to network-service-dev@.
+# NOTE: if adding an exclusion for an existing failure (e.g. additional test for
+# feature X that is already not working), please add it beside the existing
+# failures. Otherwise please reach out to network-service-dev@.

testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter

+# NOTE: if adding an exclusion for an existing failure (e.g. additional test for
+# feature X that is already not working), please add it beside the existing
+# failures. Otherwise please reach out to network-service-dev@.
+
 # http://crbug.com/715640
 -ServiceWorkerBrowserTest.FetchPageWithSaveData
 -ServiceWorkerBrowserTest.ImportsBustMemcache
@@ -68,4 +72,6 @@
 # http://crbug.com/819663.
 -WebContentsImplBrowserTest.UpdateLoadState
 
-# NOTE: before adding new exclusions, please reach out to network-service-dev@.
\ No newline at end of file
+# NOTE: if adding an exclusion for an existing failure (e.g. additional test for
+# feature X that is already not working), please add it beside the existing
+# failures. Otherwise please reach out to network-service-dev@.