Only enumerate known WinUSB devices using chrome.usb, to avoid errors

Only enumerate known WinUSB devices using chrome.usb, to avoid errors
attempting to open HID devices using libusb.

BUG=410623
Committed: https://crrev.com/073b9b87cee7317f880b656077fd488b62dcdc32
Cr-Commit-Position: refs/heads/master@{#293306}

[juanlang (chromium.org), 2014-09-04 00:10:56]

juanlang@chromium.org changed reviewers:
+ reillyg@chromium.org

[Reilly Grant (use Gerrit), 2014-09-04 00:40:10]

lgtm

[juanlang (chromium.org), 2014-09-04 00:41:17]

juanlang@chromium.org changed reviewers:
+ xiyuan@chromium.org

[xiyuan, 2014-09-04 00:43:53]

lgtm

[juanlang (chromium.org), 2014-09-04 00:51:50]

The CQ bit was checked by juanlang@chromium.org

[commit-bot: I haz the power, 2014-09-04 00:53:43]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/juanlang@chromium.org/540693002/1

[commit-bot: I haz the power, 2014-09-04 02:58:10]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-04 02:58:11]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)

[juanlang (chromium.org), 2014-09-04 02:59:25]

The CQ bit was checked by juanlang@chromium.org

[commit-bot: I haz the power, 2014-09-04 03:00:42]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/juanlang@chromium.org/540693002/1

[commit-bot: I haz the power, 2014-09-04 03:42:51]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-04 03:42:51]

Try jobs failed on following builders:
  android_clang_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_clang_d...)

[juanlang (chromium.org), 2014-09-04 15:43:13]

The CQ bit was checked by juanlang@chromium.org

[commit-bot: I haz the power, 2014-09-04 15:44:29]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/juanlang@chromium.org/540693002/1

[commit-bot: I haz the power, 2014-09-04 16:16:10]

Committed patchset #1 (id:1) as daf6a4483530e290d08f1cbfbb1573787a390d30

[commit-bot: I haz the power, 2014-09-10 03:31:43]

Patchset 1 (id:??) landed as
https://crrev.com/073b9b87cee7317f880b656077fd488b62dcdc32
Cr-Commit-Position: refs/heads/master@{#293306}