GitLab

Adjusted timeouts for a couple failing tests; switched from umount to hdiutil detach to solve some unmounting problems seen on Tiger.
Review URL: http://codereview.chromium.org/332030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@30077 0039d316-1c4b-4281-b951-d872f2087c98