UPSTREAM: core/service: Fix calling driver .accept multiple times

service_accept shall not call driver .accept callback multiple times.

BUG=chromium:547822

Change-Id: I59869764c6ec3ae26dee73a606905d84315cf317
Reviewed-on: https://chromium-review.googlesource.com/308737
Commit-Ready: Jakub x Jakub Pawlowski <[email protected]>
Tested-by: Jakub x Jakub Pawlowski <[email protected]>
Reviewed-by: Arman Uguray <[email protected]>
Reviewed-by: Jakub x Jakub Pawlowski <[email protected]>
1 file changed