Revert 229092 "Provide testing overrides for iTunes and iPhoto d..."

> Provide testing overrides for iTunes and iPhoto database locations.
> 
> BUG=NONE
> 
> Review URL: https://codereview.chromium.org/25779002

TBR=vandebo@chromium.org

Review URL: https://codereview.chromium.org/35543003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230172 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230172