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Note new documentation at https://sites.google.com/a/chromium.org/dev/developers/design-documents/service-processes

BUG=None
TEST= 1) Build.
      2) Launch Chromium with cloud print disabled.
      3) Start Terminal
      4) launchctl list
      5) You should not see any org.chromium.Chromium.framework.service_process/* processes listed
      6) Go to Preferences in chromium
      7) launchctl list
      8) You should now see a org.chromium.Chromium.framework.service_process/* process
      9) Quit chromium
      10) launchctl list
      11) There should not be any org.chromium.Chromium.framework.service_process/* processes anymore

Review URL: http://codereview.chromium.org/7736002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98221 0039d316-1c4b-4281-b951-d872f2087c98