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This test failed a few times recently in linux-chromeos-rel, which
blocked chromium.chromiumos. Disable it now.

TEST=autoninja build content_browsertests successfully

Bug: 1134455
Tbr: goto@chromium.org
Change-Id: I10b6d7e6648491a9d1b3bc9ebe4724044ee7bb0f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444610
Commit-Queue: Leo Zhang <googleo@chromium.org>
Reviewed-by: Leo Zhang <googleo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813070}