Avoid leaks at shutdown when running purify
Avoid leaks at shutdown when running purify

We'll risk a (rare) crash under purify, but avoid having a leak detected.

Note that this "leak" at shutdown is NBD, but this code at least shows
that the would be leak is "understood" and acceptable.

bug=6532
r=erikkay
Review URL: http://codereview.chromium.org/42083

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@11473 0039d316-1c4b-4281-b951-d872f2087c98

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