Remove HID devices not found during enumeration on Windows.

Remove HID devices not found during enumeration on Windows.

Windows doesn't give us fine grained notifications for device add
and remove so we must do a complete enumeration every time. This
patch figures out which devices are no longer present in the
enumeration and calls HidService::RemoveDevice.

BUG=395272
R=rockot@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=284321

[Ken Rockot(use gerrit already), 2014-07-19 00:13:51]

lgtm

https://codereview.chromium.org/399313008/diff/1/device/hid/hid_service.h
File device/hid/hid_service.h (left):

https://codereview.chromium.org/399313008/diff/1/device/hid/hid_service.h#old...
device/hid/hid_service.h:57: DeviceMap devices_;
Can you just leave this private and create a protected const accessor?

[Reilly Grant (use Gerrit), 2014-07-19 01:14:56]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2014-07-19 01:16:09]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/reillyg@chromium.org/399313008/20001

[commit-bot: I haz the power, 2014-07-19 05:11:18]

Change committed as 284321