Move UsbService to its own component.

Move UsbService to its own component.

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

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=265290

[Ken Rockot(use gerrit already), 2014-04-15 22:47:42]

Pavel could you please take a look?

[pfeldman, 2014-04-16 06:38:11]

lgtm. Please make sure it passes try bots (it currently fails).

[Ken Rockot(use gerrit already), 2014-04-17 17:15:20]

Looks like the remaining failures are not strictly related to this CL.

+jochen@ could you please review the components addition?

[jochen (gone - plz use gerrit), 2014-04-22 07:28:22]

can you please move the symbols into a new namespace? e.g. usb_service?

otherwise lgtm

[Ken Rockot(use gerrit already), 2014-04-22 14:53:01]

On 2014/04/22 07:28:22, jochen wrote:
> can you please move the symbols into a new namespace? e.g. usb_service?
> 
> otherwise lgtm

done

[Ken Rockot(use gerrit already), 2014-04-22 14:53:07]

The CQ bit was checked by rockot@chromium.org

[commit-bot: I haz the power, 2014-04-22 14:53:26]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/rockot@chromium.org/236203019/110001

[commit-bot: I haz the power, 2014-04-22 17:10:25]

Change committed as 265290