Skip imported timing tests that are too flaky on Win

LayoutTests/TestExpectations

Index: LayoutTests/TestExpectations
diff --git a/LayoutTests/TestExpectations b/LayoutTests/TestExpectations
index 01080aabfa7f56d3354f5c4ff78d96ad8f40d305..fc3a135d28fedb4415aa5434296eef38765a3d42 100644
--- a/LayoutTests/TestExpectations
+++ b/LayoutTests/TestExpectations
@@ -6,7 +6,7 @@ crbug.com/524134 virtual/spv2/paint/invalidation/invalidate-after-composited-scr
 crbug.com/524134 virtual/spv2/paint/selection/text-selection-drag.html [ ImageOnlyFailure ]
 crbug.com/524134 virtual/spv2/paint/deprecatedpaintlayer/non-self-painting-layer-overrides-visibility.html [ Crash ImageOnlyFailure Timeout ]
 crbug.com/524134 paint/invalidation/spv2/destroy-scrollbar.html [ ImageOnlyFailure ]
-crbug.com/524134 paint/invalidation/spv2/focus-ring-on-continuation-move.html [ ImageOnlyFailure ] 
+crbug.com/524134 paint/invalidation/spv2/focus-ring-on-continuation-move.html [ ImageOnlyFailure ]
 crbug.com/524134 paint/invalidation/spv2/justify-self-change-keeping-geometry.html [ ImageOnlyFailure ]
 crbug.com/524134 paint/invalidation/spv2/fixed-scroll-in-empty-root-layer.html [ ImageOnlyFailure ]
 crbug.com/524134 paint/invalidation/spv2/layout-state-only-positioned.html [ ImageOnlyFailure ]
@@ -176,8 +176,8 @@ crbug.com/518883 crbug.com/390452 http/tests/security/isolatedWorld/media-query-
 crbug.com/518987 http/tests/xmlhttprequest/navigation-abort-detaches-frame.html [ Pass Timeout ]
 crbug.com/518988 [ Win7 ] http/tests/xmlhttprequest/xmlhttprequest-50ms-download-dispatch.html [ Failure Pass ]
 crbug.com/518989 [ Mac ] imported/csswg-test/css-writing-modes-3/writing-mode-vertical-rl-002.xht [ ImageOnlyFailure Pass Timeout ]
-crbug.com/518992 imported/web-platform-tests/user-timing/test_user_timing_measure.html [ Failure Pass ]
-crbug.com/518993 imported/web-platform-tests/user-timing/test_user_timing_measure_navigation_timing.html [ Failure Pass ]
+crbug.com/518992 [ Win ] imported/web-platform-tests/user-timing/test_user_timing_measure.html [ Skip ]
+crbug.com/518993 [ Win ] imported/web-platform-tests/user-timing/test_user_timing_measure_navigation_timing.html [ Skip ]
 crbug.com/518995 media/track/media-element-move-to-new-document-assert.html [ Failure Pass ]
 crbug.com/518998 media/video-poster-after-loadedmetadata.html [ ImageOnlyFailure Pass ]