Remove callbacks on USB manipulation methods.

Remove callbacks on USB manipulation methods.
They will be restricted to FILE thread. No need for callback.

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=213314

[Bei Zhang, 2013-07-23 19:46:07]

Hi Pavel,

Please review.

Thanks,
Bei

[pfeldman, 2013-07-23 20:17:49]

lgtm

[Bei Zhang, 2013-07-23 20:38:25]

Hi Antony,

Please give an owner's review on the following file:

chrome/browser/extensions/api/usb/usb_api.cc

Thanks,
Bei

[asargent_no_longer_on_chrome, 2013-07-23 21:43:35]

When I try to view the diffs I get an error about chunk mismatch and don't see
any contents. Can you try re-running git cl upload?

[Bei Zhang, 2013-07-23 21:51:23]

On 2013/07/23 21:43:35, Antony Sargent wrote:
> When I try to view the diffs I get an error about chunk mismatch and don't see
> any contents. Can you try re-running git cl upload?

Done.

[asargent_no_longer_on_chrome, 2013-07-23 22:29:00]

lgtm

[commit-bot: I haz the power, 2013-07-23 22:55:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ikarienator@chromium.org/19981004/50001

[commit-bot: I haz the power, 2013-07-24 01:35:46]

Change committed as 213314