Suppresses the leaks for Bug 86006.

This change suppresses the leask in SyncSetupWizard::Step(). (He told me he will fix them tomorrow.)

TBR=timurrrr,glider,thestig
BUG=86006
TEST=make the "Linux Heapcheck" bot and the "Linux Tests (valgrind)(1)" bot greener.
Review URL: http://codereview.chromium.org/7131010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@88955 0039d316-1c4b-4281-b951-d872f2087c98