The first run sentinel does not get created for system install - Vista case mostly if user has UAC enabled - The sentinel path is not writeable if you are not elevated so   first run keeps happening every time.
The first run sentinel does not get created for system install
- Vista case mostly if user has UAC enabled
- The sentinel path is not writeable if you are not elevated so
  first run keeps happening every time.

BUG=1503885

Review URL: http://codereview.chromium.org/12650

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@5994 0039d316-1c4b-4281-b951-d872f2087c98

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