Manage HidService lifetime in DeviceClient implementations.

Manage HidService lifetime in DeviceClient implementations.

To make it easier to reason about when the HidService is destroyed this
patch makes its lifetime managed by the DeviceClient implementation that
created it. This means that in Chrome the HidService is (indirectly)
owned by BrowserProcessImpl.

BUG=None

Committed: https://crrev.com/33338fc038bed55f7f32c0805eee01e2b88f1c13
Cr-Commit-Position: refs/heads/master@{#346272}

[Reilly Grant (use Gerrit), 2015-08-28 20:06:12]

Patchset #1 (id:1) has been deleted

[Reilly Grant (use Gerrit), 2015-08-28 21:51:44]

Patchset #1 (id:20001) has been deleted

[Reilly Grant (use Gerrit), 2015-08-28 21:51:51]

Patchset #1 (id:40001) has been deleted

[Reilly Grant (use Gerrit), 2015-08-28 22:34:59]

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

[Reilly Grant (use Gerrit), 2015-08-28 22:34:59]

Please take a look. I'm liking this pattern more and more.

[Ken Rockot(use gerrit already), 2015-08-28 22:53:19]

nice - lgtm

[Reilly Grant (use Gerrit), 2015-08-28 23:10:41]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2015-08-28 23:11:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1312993008/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1312993008/60001

[commit-bot: I haz the power, 2015-08-28 23:41:16]

Committed patchset #1 (id:60001)

[commit-bot: I haz the power, 2015-08-28 23:42:02]

Patchset 1 (id:??) landed as
https://crrev.com/33338fc038bed55f7f32c0805eee01e2b88f1c13
Cr-Commit-Position: refs/heads/master@{#346272}