Mark inspector/tracing/timeline-node-reference.html as flaky/crash

BUG=572726
TBR=pfeldman@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/1547333002

Cr-Commit-Position: refs/heads/master@{#367012}

third_party/WebKit/LayoutTests/TestExpectations

@@ -1351,3 +1351,5 @@ crbug.com/572714 [ Linux XP ] inspector/sources/debugger/debug-inlined-scripts.h
 crbug.com/572723 [ Mac10.7 Release ] inspector/sources/debugger/debugger-completions-on-call-frame.html [ Timeout Pass ]
 crbug.com/572723 [ Linux Mac10.9 ] inspector/sources/debugger/debugger-disable-enable.html [ Pass Failure Timeout ]
 crbug.com/572723 [ Mac Release ] inspector/sources/debugger/debugger-uncaught-promise-on-pause.html [ Timeout Pass ]
+
+crbug.com/572726 inspector/tracing/timeline-node-reference.html [ Timeout Pass Crash ]