Sheriff: Disable geolocation-api/watchPosition-page-visibility.html test.

Disable geolocation-api/watchPosition-page-visibility.html blink web test.
It's flaky on OSX.

TBR=scheib@chromium.org

Bug: 1083824
Change-Id: Ice34348bc3e9e6de24b04859269c04d379b2be7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2206194Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#769611}

third_party/blink/web_tests/TestExpectations

@@ -1606,6 +1606,7 @@ crbug.com/944583 [ Mac ] fast/events/platform-wheelevent-paging-x-in-scrolling-p
 crbug.com/944583 [ Mac ] fast/events/platform-wheelevent-paging-y-in-scrolling-page.html [ Pass Failure Timeout ]
 # Sheriff: 2020-05-18
 crbug.com/1083820 [ Mac ] fast/scrolling/document-level-wheel-event-listener-passive-by-default.html [ Pass Failure ]
+crbug.com/1083824 [ Mac ] geolocation-api/watchPosition-page-visibility.html [ Pass Failure ]
 
 # In external/wpt/html/, we prefer checking in failure
 # expectation files. The following tests with [ Failure ] don't have failure