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Sandbox::AllowMetadataForPath() currently allow all metadata access due to
https://codereview.chromium.org/10539009/ made the for loop comparison
in Sandbox::AllowMetadataForPath() always false, when we actually only
want to allow access to the path and all its parent path until root.

Turn the for loop to a do/while loop instead as it's a better fit, also
add a test case for Sandbox::AllowMetadataForPath().

It should only affect component builds on OS X 10.6 and utility process
as no other process is using this mechanism.

Review URL: https://codereview.chromium.org/472513002

Cr-Commit-Position: refs/heads/master@{#289526}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289526 0039d316-1c4b-4281-b951-d872f2087c98