Adjust limit for booted memory test.
Adjust limit for booted memory test.

a previous change decreased the size of a zone object and it seems
that sometimes the OS report more memory used even though there
is less zone allocation.
Review URL: https://chromiumcodereview.appspot.com/9443019

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@10814 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

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