Allowing some flaky websocket/workers/worker-*.html tests to timeout.

BUG=671618
TBR=ricea@chromium.org
NOTRY=true
NOPRESUBMIT=true
NOTREECHECKS=true

Review-Url: https://codereview.chromium.org/2552923003
Cr-Commit-Position: refs/heads/master@{#436596}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1913,3 +1913,8 @@ Bug(dpranke) imported/wpt/service-workers/service-worker/register-closed-window.
 
 # Added 2016-11-30
 crbug.com/669911 [ Win7 Win10 ] virtual/threaded/animations/zoom-responsive-transform-animation.html [ Pass Failure Timeout ]
+
+# Added 2015-12-06
+crbug.com/671618 http/tests/websocket/workers/worker-reload.html [ Pass Timeout ]
+crbug.com/671618 virtual/mojo-loading/http/tests/websocket/workers/worker-reload.html [ Pass Timeout ]
+crbug.com/671618 virtual/mojo-loading/http/tests/websocket/workers/worker-shutdown-race.html [ Pass Timeout ]