[Mac] Make zombie-only mode a tiny bit more efficient.
[Mac] Make zombie-only mode a tiny bit more efficient.

Pull the test for zombie-only mode out of the lock.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/2581003

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@48930 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser