Mark some intentional failures in wpt/infrastructure

These tests test the infrastructure of WPT (runner) and are intended to
fail in various ways, similar to the tests in harness-tests/.

TBR=foolip

Bug: 838135
Change-Id: I805231dc098a4569ac31c537bf3cadbb8e543d3f
Reviewed-on: https://chromium-review.googlesource.com/1035613Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554821}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5,6 +5,10 @@
 # Intentional failures to test the layout test system.
 Bug(intentional) harness-tests/crash.html [ Crash ]
 Bug(intentional) harness-tests/timeout.html [ Timeout ]
+Bug(intentional) external/wpt/infrastructure/reftest/reftest_timeout.html [ Timeout ]
+Bug(intentional) external/wpt/infrastructure/reftest/reftest_mismatch_fail.html [ Failure ]
+Bug(intentional) external/wpt/infrastructure/reftest/reftest_ref_timeout.html [ Timeout ]
+Bug(intentional) external/wpt/infrastructure/reftest/reftest_match_fail.html [ Failure ]
 
 crbug.com/807686 crbug.com/24182 jquery/manipulation.html [ Timeout Pass ]
 
@@ -2295,10 +2299,6 @@ crbug.com/836627 external/wpt/content-security-policy/inside-worker/dedicated-in
 crbug.com/836627 external/wpt/content-security-policy/inside-worker/shared-inheritance.html [ Pass Failure ]
 
 # ====== New tests from wpt-importer added here ======
-crbug.com/626703 external/wpt/infrastructure/reftest/reftest_timeout.html [ Timeout ]
-crbug.com/626703 external/wpt/infrastructure/reftest/reftest_mismatch_fail.html [ Failure ]
-crbug.com/626703 external/wpt/infrastructure/reftest/reftest_ref_timeout.html [ Timeout ]
-crbug.com/626703 external/wpt/infrastructure/reftest/reftest_match_fail.html [ Failure ]
 crbug.com/626703 external/wpt/css/cssom-view/scroll-behavior-smooth.html [ Timeout ]
 crbug.com/626703 external/wpt/service-workers/service-worker/fetch-event-is-reload-navigation-manual.https.html [ Skip ]
 crbug.com/626703 virtual/outofblink-cors/external/wpt/service-workers/service-worker/fetch-event-is-reload-navigation-manual.https.html [ Skip ]