Remove the leak expectation for web-animations-api/player-cancel-event.html since it seems to be wo…

third_party/WebKit/LayoutTests/LeakExpectations

 # This file is used for tests that only need to be suppressed on the Chromium
 # WebKit Leak bots.
 #
 # This list isn't comprehensive yet, and Leak Detector bots are not tree closers atm.
 # Gardeners are welcome to touch this file, but you can ignore the failures
 # and wait for kouhei@ or hajimehoshi@ to maintain this file.
 
 # view-source:// tests are not supported by the leak detector
 crbug.com/364398 fast/frames/viewsource/viewsource-1.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-2.html [ Leak ]
@@ skipping 76 matching lines @@
 crbug.com/482050 svg/custom/use-event-handler-on-referenced-element.svg [ Leak ]
 crbug.com/482050 svg/custom/use-event-handler-on-use-element.svg [ Leak ]
 crbug.com/482050 svg/zoom/text/absolute-sized-document-no-scrollbars.svg [ Leak ]
 crbug.com/482050 svg/zoom/text/absolute-sized-document-scrollbars.svg [ Leak ]
 crbug.com/482050 svg/zoom/text/relative-sized-document-scrollbars.svg [ Leak ]
 crbug.com/482050 svg/zoom/text/zoom-coords-viewattr-01-b.svg [ Leak ]
 crbug.com/482050 svg/zoom/text/zoom-foreignObject.svg [ Leak ]
 crbug.com/564571 virtual/threaded/animations/svg-length-unittype-crash.html [ Leak ]
 crbug.com/571534 virtual/threaded/animations/svg-element-css-animation-crash.html [ Leak ]
 
-crbug.com/588598 web-animations-api/player-cancel-event.html [ Leak ]
-
 # -----------------------------------------------------------------
 # Untriaged but known leaks of ActiveDOMObject (fast).
 # -----------------------------------------------------------------
 crbug.com/506529 fast/mediastream/MediaStreamConstructor.html [ Leak ]
 crbug.com/506529 fast/events/constructors/media-stream-event-constructor.html [ Leak ]
 crbug.com/506529 fast/files/workers/worker-read-blob-async-crash.html [ Leak ]
 crbug.com/506529 virtual/pointerevent/fast/events/constructors/media-stream-event-constructor.html [ Leak ]
 
 # -----------------------------------------------------------------
 # Untriaged but known leaks of ActiveDOMObject (IndexedDB).
@@ skipping 29 matching lines @@
 crbug.com/538524 editing/selection/modify-crash.html [ Leak ]
 crbug.com/546132 editing/execCommand/insert-html-to-document-element-crash.html [ Leak ]
 
 crbug.com/451577 [ Linux ] inspector/elements/user-properties.html [ Slow ]
 crbug.com/451577 [ Linux ] inspector/extensions/extensions-reload.html [ Slow ]
 crbug.com/451577 [ Linux ] inspector/extensions/extensions-sidebar.html [ Slow ]
 
 crbug.com/578297 [ Linux ] media/video-autoplay-experiment-modes.html [ Slow ]
 crbug.com/578297 [ Linux ] virtual/threaded/printing/webgl-oversized-printing.html [ Slow ]
 crbug.com/578297 [ Linux ] http/tests/media/media-source/mediasource-appendstream-quota-exceeded.html [ Slow ]