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The test flakily crashes with an unknown callstack (the crash is not
reproducible locally).  The speculation is that the crash is related
to dereferencing a null base::MemoryPressureMonitor::Get().  If this is
indeed the case, then the crash should be fixed by using
base::test::FakeMemoryPressureMonitor in the test (rather than directly
dispatching a memory pressure notification from the test).

Bug: 887545
Change-Id: Ib922ebe4c7f85ec028f4bb202f2357c71e20687a
Reviewed-on: https://chromium-review.googlesource.com/1236502Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592913}