Mark pointerevent_pointercapture_in_frame as failing on Mac.

TBR=eirage@chromium.org

Bug: 1040874
Change-Id: Iec6b2cc5a72e1b3256d66b8acf09f515e8a0b250
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1995164Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#730126}

third_party/blink/web_tests/TestExpectations

@@ -3696,6 +3696,7 @@ crbug.com/626703 [ Linux ] external/wpt/service-workers/service-worker/ready.htt
 crbug.com/626703 [ Mac ] external/wpt/service-workers/service-worker/ready.https.window.html [ Timeout ]
 crbug.com/626703 [ Win ] external/wpt/service-workers/service-worker/ready.https.window.html [ Timeout ]
 crbug.com/626703 [ Win7 ] external/wpt/pointerevents/pointerevent_touch-action-pan-x-css_touch.html [ Timeout ]
+crbug.com/1040874 [ Mac ] external/wpt/pointerevents/pointerevent_pointercapture_in_frame.html [ Pass Failure ]
 crbug.com/626703 [ Linux ] external/wpt/css/motion/offset-anchor-transform-box-fill-box-003.html [ Failure ]
 crbug.com/626703 [ Mac ] external/wpt/css/motion/offset-anchor-transform-box-fill-box-003.html [ Failure ]
 crbug.com/626703 [ Win ] external/wpt/css/motion/offset-anchor-transform-box-fill-box-003.html [ Failure ]