Update WPT Expectation 2d.pattern.basic.nocontext

external/wpt/offscreen-canvas/fill-and-stroke-styles/
2d.pattern.basic.nocontext.worker.html
was disabled as crashing when the .any.js tests were added,
but is now unexpectedly just failing.

Highly likely that some fix in the last year and a half has
rendered this less broken.

https://test-results.appspot.com/dashboards/flakiness_dashboard.html#
    testType=webkit_layout_tests&
    tests=2d.pattern.basic.nocontext.worker.html

and trybots for previous patchsets for reference and examples of the
various behaviors. Notably, the test crashes (fails a DCHECK) on CQ
and some debug bots. (Un)fortunately, the expectations language can't
express the variance in this test's expectation.  Each bot type in
itself tends to be consistent.

Bug: 709227
Change-Id: I6522468d656fd6a4dfcb56af9ce05a11e9bc9aa4
Reviewed-on: https://chromium-review.googlesource.com/1134022Reviewed-by: Peter Mayo <petermayo@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Commit-Queue: Peter Mayo <petermayo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575329}

third_party/WebKit/LayoutTests/TestExpectations

@@ -3685,7 +3685,7 @@ crbug.com/709227 external/wpt/offscreen-canvas/the-offscreen-canvas/size.attribu
 crbug.com/709227 external/wpt/user-timing/invoke_with_timing_attributes.worker.html [ Failure ]
 
 # Crashes
-crbug.com/709227 external/wpt/offscreen-canvas/fill-and-stroke-styles/2d.pattern.basic.nocontext.worker.html [ Crash ]
+crbug.com/709227 external/wpt/offscreen-canvas/fill-and-stroke-styles/2d.pattern.basic.nocontext.worker.html [ Crash Pass ]
 
 # ====== Tests from enabling .any.js/.worker.js tests end here ========