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This test is slow on debug builds in general but on Mac and Win it's
slow enough to cause timeout flakes.

FIX: Set the entry-count limit to 10. This test takes 15s on my desktop
before this change and 6 afterwards, so the build bots should be OK.

Bug: 1167300
Change-Id: Iaf3cf63aed26dc0a79a02cb6b2af6ecada30303f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2636633Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Fergal Daly <fergal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844669}