Mark page-lifecycleEvents.js as flaky.

It was reenabled in f73246ba.
No, it is still flaky.

BUG=845267
TBR=kbr@chromium.org

Change-Id: I4ad193b01738945c63dfa12585be7b9354408b49
Reviewed-on: https://chromium-review.googlesource.com/1118528Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571169}

third_party/WebKit/LayoutTests/TestExpectations

@@ -95,6 +95,8 @@ crbug.com/816045 [ Win Linux Mac ] virtual/gpu/fast/canvas/canvas-imageSmoothing
 # seem to fix it.
 crbug.com/309675 compositing/gestures/gesture-tapHighlight-simple-longPress.html [ Failure ]
 
+crbug.com/845267 [ Mac ] http/tests/inspector-protocol/page/page-lifecycleEvents.js [ Failure Pass ]
+
 # SwiftShader Failures
 crbug.com/726075 [ Win Linux Mac ] compositing/3d-cube.html [ Failure ]
 crbug.com/726075 [ Linux ] shapedetection/detection-HTMLVideoElement.html [ Timeout ]