[Picture-in-Picture] Re-enable devtools test.

This CL is a follow-up of https://chromium-review.googlesource.com/c/chromium/src/+/1303364

Bug: 891427
Change-Id: Ie3075933134463107e43d2f452cc025405ba19c5
Reviewed-on: https://chromium-review.googlesource.com/c/1307394Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#604595}

third_party/WebKit/LayoutTests/TestExpectations

@@ -71,8 +71,7 @@ crbug.com/891427 virtual/threaded/http/tests/devtools/tracing/timeline-paint/tim
 crbug.com/891427 http/tests/devtools/tracing/timeline-paint/timeline-paint-image.js [ Pass Failure Timeout Crash ]
 # Next 1 here: https://ci.chromium.org/buildbot/tryserver.blink/win7-blink-rel/1180
 crbug.com/891427 editing/pasteboard/drop-text-without-selection.html [ Pass Failure Timeout Crash ]
-# Next 5 here: https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux-blink-rel/1541
-crbug.com/891427 http/tests/devtools/sources/debugger-breakpoints/picture-in-picture-event-listener-breakpoints.js [ Skip ]
+# Next 4 here: https://ci.chromium.org/p/chromium/builders/luci.chromium.try/linux-blink-rel/1541
 crbug.com/891427 virtual/android/rootscroller/gesture-scroll-document-not-root-scroller.html [ Pass Failure Timeout Crash ]
 crbug.com/891427 virtual/threaded/fast/events/pinch/pinch-zoom-pan-within-zoomed-viewport.html [ Pass Failure Timeout Crash ]
 crbug.com/891427 virtual/threaded/http/tests/devtools/tracing/timeline-paint/timeline-paint-with-style-recalc-invalidations.js [ Pass Failure Timeout Crash ]

third_party/WebKit/LayoutTests/http/tests/devtools/sources/debugger-breakpoints/picture-in-picture-event-listener-breakpoints-expected.txt

+Tests Picture-in-Picture event listener breakpoints.
+
+
+Running: testPlayVideoEventBreakpoint
+Script execution paused.
+Call stack:
+    0) onVideoPlay (picture-in-picture-event-listener-breakpoints.js:22)
+Event target: VIDEO
+Script execution resumed.
+
+Running: testEnterPictureInPictureEventBreakpoint
+Script execution paused.
+Call stack:
+    0) onEnterPictureInPicture (picture-in-picture-event-listener-breakpoints.js:34)
+Event target: VIDEO
+Script execution resumed.
+
+Running: testLeavePictureInPictureEventBreakpoint
+Script execution paused.
+Call stack:
+    0) onLeavePictureInPicture (picture-in-picture-event-listener-breakpoints.js:46)
+Event target: VIDEO
+Script execution resumed.
+