Remove a couple of external/wpt/workers/ failure expectations.

These tests are reliably passing:
https://test-results.appspot.com/dashboards/flakiness_dashboard.html#testType=webkit_layout_tests&tests=external%2Fwpt%2Fworkers%2Fbaseurl%2Falpha%2Fworker-in-worker.html%2Cexternal%2Fwpt%2Fworkers%2FWorker_ErrorEvent_error.htm

Bug: 655458
Change-Id: I1b58a462249f9b7f19644958c717dc9e59d4eac7
Reviewed-on: https://chromium-review.googlesource.com/c/1289078Reviewed-by: Ojan Vafai <ojan@chromium.org>
Commit-Queue: Ojan Vafai <ojan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600856}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3856,8 +3856,7 @@ crbug.com/626703 external/wpt/css/css-ui/text-overflow-011.html [ Failure Crash
 crbug.com/626703 external/wpt/html/rendering/non-replaced-elements/margin-collapsing-quirks/multicol-quirks-mode.html [ Pass Crash ]
 crbug.com/626703 external/wpt/html/rendering/non-replaced-elements/margin-collapsing-quirks/multicol-standards-mode.html [ Pass Crash Failure ]
 
-# Worker/SharedWorker are not exposed in WorkerGlobalScope.
-crbug.com/850662 external/wpt/workers/baseurl/alpha/worker-in-worker.html [ Failure ]
+# SharedWorker are not exposed in WorkerGlobalScope.
 crbug.com/850662 external/wpt/workers/baseurl/alpha/sharedworker-in-worker.html [ Failure ]
 
 # crbug.com/861564 is ongoing for module dedicated workers.
@@ -3885,7 +3884,6 @@ crbug.com/655458 external/wpt/workers/semantics/interface-objects/003.html [ Fai
 crbug.com/655458 external/wpt/workers/constructors/Worker/unresolvable-url.html [ Failure ]
 crbug.com/655458 external/wpt/workers/semantics/interface-objects/004.html [ Failure ]
 crbug.com/655458 external/wpt/workers/interfaces/WorkerUtils/importScripts/004.html [ Failure ]
-crbug.com/655458 external/wpt/workers/Worker_ErrorEvent_error.htm [ Failure ]
 crbug.com/655458 external/wpt/workers/semantics/reporting-errors/002.html [ Failure ]
 crbug.com/655458 external/wpt/workers/semantics/reporting-errors/001.html [ Failure ]
 crbug.com/655458 external/wpt/workers/semantics/run-a-worker/003.html [ Failure ]