[Sheriff] Mark geolocation-api/watchPosition-page-visibility.html as

flaky on Win10 as well as Win7.

Bug: 1083585
Change-Id: I19a98281082642f31e75f8dd07403c385af7eb56
Tbr: danakj@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2219096Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: David Bertoni <dbertoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772528}

third_party/blink/web_tests/TestExpectations

@@ -5891,5 +5891,5 @@ crbug.com/1071189 [ Debug ] editing/selection/programmatic-selection-on-mac-is-d
 crbug.com/1086353 [ Win ] http/tests/websocket/close-in-order.html [ Pass Failure ]
 
 # Sheriff 2020-05-27
-crbug.com/1083585 [ Win7 ] geolocation-api/watchPosition-page-visibility.html [ Pass Failure ]
+crbug.com/1083585 [ Win ] geolocation-api/watchPosition-page-visibility.html [ Pass Failure ]
 crbug.com/1046784 http/tests/devtools/elements/styles/stylesheet-tracking.js [ Pass Failure Timeout ]