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In order to manage device media gallery permissions, use a device id that is unique and persistent across device attachments. Therefore, extract device uuid from DiskInfo::InitializeFromResponse and use that identifier while dispatching media device attached notification event.

BUG=none
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10830003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@149099 0039d316-1c4b-4281-b951-d872f2087c98