Disable webkit layout test on Mac 10.13

Disabling:
http/tests/devtools/tracing/timeline-js/timeline-script-tag-1.js

TBR=dgozman@chromium.org

Bug: 859629
Change-Id: I8e5bb8aef555d24f38fa7e386d315d05d147df7e
Reviewed-on: https://chromium-review.googlesource.com/1125358
Commit-Queue: Sarah Chan <spqchan@chromium.org>
Reviewed-by: Sarah Chan <spqchan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572412}

third_party/WebKit/LayoutTests/TestExpectations

@@ -4734,10 +4734,11 @@ crbug.com/859270 [ Mac10.12 ] external/wpt/gyroscope/Gyroscope-iframe-access.htt
 
 # Sheriff 2018-07-02
 crbug.com/859605 [ Mac10.10 ] external/wpt/shadow-dom/untriaged/events/retargeting-focus-events/test-002.html [ Failure ]
-crbug.com/859681 [ Mac10.13 ] http/tests/devtools/tracing/timeline-time/timeline-time.js [ Failure ]
-crbug.com/859681 [ Mac10.13 ] http/tests/devtools/tracing/timeline-time/timeline-usertiming.js [ Failure ]
-crbug.com/859681 [ Mac10.13 ] virtual/threaded/http/tests/devtools/tracing/console-timeline.js [ Failure ]
-crbug.com/859681 [ Linux Mac10.13 ] virtual/threaded/http/tests/devtools/tracing/timeline-time/timeline-time.js [ Failure ]
+crbug.com/859629 [ Mac10.13 ] http/tests/devtools/tracing/timeline-time/timeline-time.js [ Failure ]
+crbug.com/859629 [ Mac10.13 ] http/tests/devtools/tracing/timeline-time/timeline-usertiming.js [ Failure ]
+crbug.com/859629 [ Mac10.13 ] virtual/threaded/http/tests/devtools/tracing/console-timeline.js [ Failure ]
+crbug.com/859629 [ Linux Mac10.13 ] virtual/threaded/http/tests/devtools/tracing/timeline-time/timeline-time.js [ Failure ]
 
 # Sheriff 2018-07-03
 crbug.com/860031 [ Linux ] http/tests/object/remote-frame-crash.html [ Failure ]
+crbug.com/859629 [ Mac10.13 ] http/tests/devtools/tracing/timeline-js/timeline-script-tag-1.js [ Failure ]