Allow external/wpt/webrtc/receiver-track-live.https.html to fail.

Despite this test already being marked as [ Pass Crash ], when the
test crashes on the bots, the Flake Portal registers the crash not as
a crash but as a failure, see https://crbug.com/1094930#c25.

For now, I'm marking this test as [ Pass Crash Failure ].

TBR=hta@chromium.org

Bug: chromium:1094930
Change-Id: Ic6e1b54798ba53302ef1b7ac9dee4b06cba2a08c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517462
Auto-Submit: Henrik Boström <hbos@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823661}

third_party/blink/web_tests/TestExpectations

@@ -5929,7 +5929,8 @@ crbug.com/1093026 [ Win10 ] http/tests/security/offscreencanvas-placeholder-read
 crbug.com/915903 http/tests/security/inactive-document-with-empty-security-origin.html [ Pass Timeout ]
 
 # Ecosystem-Infra Rotation 2020-06-15
-crbug.com/1094930 external/wpt/webrtc/receiver-track-live.https.html [ Pass Crash ]
+# Flake Portal seem to be reporting crashes as failures, so we expect that as well.
+crbug.com/1094930 external/wpt/webrtc/receiver-track-live.https.html [ Pass Crash Failure ]
 
 crbug.com/924472 external/wpt/css/css-transforms/transform-box/cssbox-content-box.html [ Failure ]
 crbug.com/924472 external/wpt/css/css-transforms/transform-box/cssbox-border-box.html [ Failure ]