Increase acceptable boot up memory size in tests for parallel sweeper threads.
Increase acceptable boot up memory size in tests for parallel sweeper threads.

BUG=

Review URL: https://codereview.chromium.org/12310168

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@13760 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh