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This private API exposes more information about connected USB devices
than the public chrome.usb API. It is designed for use by WEBUI
components that wish to display information about connected to devices
to the user such as the dialog box shown by the proposed
chrome.usb.getUserSelectedDevices API.

BUG=346953

Review URL: https://codereview.chromium.org/463493006

Cr-Commit-Position: refs/heads/master@{#289530}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289530 0039d316-1c4b-4281-b951-d872f2087c98