disable flaky layouttest sampling-native-profile-partition-alloc.js

TBR=alph@chromium.org

Bug: 905772
Change-Id: Ide0a5695213b14266e154dab9bbf0103f86713b8
Reviewed-on: https://chromium-review.googlesource.com/c/1338321Reviewed-by: Ella Ge <eirage@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608487}

third_party/WebKit/LayoutTests/TestExpectations

@@ -5379,4 +5379,5 @@ crbug.com/497522 external/wpt/css/filter-effects/backdrop-filter-isolation-isola
 crbug.com/497522 external/wpt/css/filter-effects/backdrop-filter-border-radius.html [ Failure ]
 
 #Sheriff 2018-11-14
-crbug.com/905694 [ Linux ] virtual/threaded/fast/scroll-behavior/smooth-scroll/scroll-during-selection.html [ Failure Pass ]
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+crbug.com/905694 [ Linux ] virtual/threaded/fast/scroll-behavior/smooth-scroll/scroll-during-selection.html [ Failure Pass ]
+crbug.com/905772 [ Linux ] virtual/sampling-heap-profiler/inspector-protocol/memory/sampling-native-profile-partition-alloc.js [ Failure Pass ]
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