GitLab

This establishes a new usb_service component from
the former contents of //chrome/browser/usb so that
non-Chrome browser code may also depend upon it.

BUG=361000
R=pfeldman@chromium.org
TBR=derat@chromium.org for DEPS +chromeos
TBR=cbentzel@chromium.org for DEPS +net/base

Review URL: https://codereview.chromium.org/236203019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@265290 0039d316-1c4b-4281-b951-d872f2087c98