Remove flaky expectations for parent-flow-inline-with-block-child.html

It's been green since it was converted to a reftest in r179707:
https://codereview.chromium.org/451483004
http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=parent-flow-inline-with-block-child.html

BUG=331576

Review URL: https://codereview.chromium.org/455803002

git-svn-id: svn://svn.chromium.org/blink/trunk@179912 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/TestExpectations

@@ -667,8 +667,6 @@ crbug.com/324369 virtual/softwarecompositing/video/video-reflection.html [ Failu
 
 crbug.com/328234 fast/css/mask-missing-image-crash.html [ Pass Failure ]
 
-crbug.com/331576 [ Mac ] fullscreen/parent-flow-inline-with-block-child.html [ Pass ImageOnlyFailure Crash ]
-
 crbug.com/326524 virtual/threaded/compositing/visibility/visibility-simple-video-layer.html [ Pass ImageOnlyFailure Timeout ]
 
 # ASSERT fails in debug since editing attempts to put a Position on a pseudo element.