Disable measure-updated-layout.html on linux

Test is flaky

TBR=maxmorin@chromium.org
NOTRY=true

Bug: 919096
Change-Id: I90e8113f1e1271ff9faaa6185bb34036916b2f4f
Reviewed-on: https://chromium-review.googlesource.com/c/1396222Reviewed-by: Xida Chen <xidachen@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619952}

third_party/blink/web_tests/TestExpectations

@@ -6035,3 +6035,6 @@ crbug.com/917970 [ Mac10.13 Retina ] virtual/mouseevent_fractional/fast/events/p
 
 # Sheriff 2019-01-03
 crbug.com/918905 [ Mac Linux ] external/wpt/css/vendor-imports/mozilla/mozilla-central-reftests/sizing/block-size-with-min-or-max-content-table-1b.html [ Pass Failure ]
+
+# Sheriff 2019-01-04
+crbug.com/919096 [ Linux ] virtual/display-lock/display-lock/lock-before-append/measure-updated-layout.html [ Timeout Pass ]