Suppress failing tests on mojo fyi bot.

TBR=kinuko@chromium.org

Bug: 803958
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I80bf960f2d4ec54bf60ff83c5d734571cd946c47
Reviewed-on: https://chromium-review.googlesource.com/876901
Commit-Queue: Randy Smith <rdsmith@chromium.org>
Reviewed-by: Randy Smith <rdsmith@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530627}

third_party/WebKit/LayoutTests/FlagExpectations/enable-features=NetworkService

@@ -241,3 +241,10 @@ Bug(none) http/tests/devtools/audits2/audits2-successful-run.js [ Failure ]
 
 # Started failing @ r529490
 Bug(none) virtual/layout_ng/fast/inline/positioned-object-between-replaced-elements.html [ Failure ]
+
+# http://crbug.com/803958: Tests failing on bot but not in local checkout.
+crbug.com/803958 external/wpt/websockets/cookies/001.html?wss [ Failure ]
+crbug.com/803958 external/wpt/websockets/cookies/002.html?wss [ Failure ]
+crbug.com/803958 external/wpt/websockets/cookies/003.html?wss [ Failure ]
+crbug.com/803958 external/wpt/websockets/cookies/007.html [ Failure ]
+crbug.com/803958 external/wpt/websockets/cookies/007.html?wss [ Failure ]