GitLab

There are two possible race conditions in walking the heaps returned
by GetProcessHeaps and on Windows XP we hit one of these race conditions,
manifested in a crash, on 42 of the last 200 base unittests. Disabling
the test entirely until a better fix is found (or perhaps forever).

The unreliability of the underlying code is acceptable for tracing,
although perhaps not acceptable for tracing on XP given the failure rate.

TBR=sebmarchand@chromium.org,primiano@chromium.org
BUG=487291

Review URL: https://codereview.chromium.org/1140943006

Cr-Commit-Position: refs/heads/master@{#330423}