Mark...

Mark external/wpt/html/infrastructure/urls/dynamic-changes-to-base-urls/dynamic-urls.sub.html as flaky

... and
external/wpt/html/infrastructure/urls/dynamic-changes-to-base-urls/historical.sub.xhtml

BUG=962139
TBR=aboxhall@chromium.org
NOTRY=true

Change-Id: Ib51cc4b46b5601a8d31d80599cc267ea62754743
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1608086Reviewed-by: Alexei Filippov <alph@chromium.org>
Commit-Queue: Alexei Filippov <alph@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658905}

third_party/blink/web_tests/TestExpectations

@@ -5559,3 +5559,7 @@ crbug.com/960623 [ Win ] http/tests/misc/resource-timing-sizes-multipart.html [
 
 # This test might need to be removed.
 crbug.com/954349 fast/forms/autofocus-in-sandbox-with-allow-scripts.html [ Timeout ]
+
+# Sheriff 2019-05-11
+crbug.com/962139 [ Linux Debug ] external/wpt/html/infrastructure/urls/dynamic-changes-to-base-urls/dynamic-urls.sub.html [ Pass Crash ]
+crbug.com/962139 [ Linux Debug ] external/wpt/html/infrastructure/urls/dynamic-changes-to-base-urls/historical.sub.xhtml [ Pass Crash ]