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One of the assumptions of the newly added tests was violated under a sanitizer
build. This is not particularly surprising, so I disabled that check for
sanitizer builds.

> I added two tests for memory leaks in the attachment brokering process. The
> first checks memory usage after brokering a single, large, shared memory object.
> The second checks memory usage after brokering a thousand, smaller memory
> objects.
>
> BUG=557387
> Committed: https://crrev.com/a519e56d03e1f6d69b7475bdd006f5e47b4f581e
> Cr-Commit-Position: refs/heads/master@{#360935}

BUG=557387

Review URL: https://codereview.chromium.org/1464413002

Cr-Commit-Position: refs/heads/master@{#361391}