Mojo: Make device/ to not rely on connecton error notification on message loop destruction.

Mojo: Make device/ to not rely on connecton error notification on message loop destruction.

- Make device/usb to use StrongBinding wherever possible.
- Remove unnecessary DCHECK from DataSourceSender.

This is a preparation for removing connection error notification on message loop destruction.

BUG=604762
Committed: https://crrev.com/0950cefe4e9c89fd11c4077123b9084c8173fdd9
Cr-Commit-Position: refs/heads/master@{#389926}

[yzshen1, 2016-04-26 21:35:23]

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

[yzshen1, 2016-04-26 21:35:23]

Hi, Ken.

Please take a look. Thanks!

[Ken Rockot(use gerrit already), 2016-04-26 21:36:19]

lgtm

[yzshen1, 2016-04-26 21:36:56]

On 2016/04/26 21:36:19, Ken Rockot wrote:
> lgtm

That is fast!

[yzshen1, 2016-04-26 21:37:02]

The CQ bit was checked by yzshen@chromium.org

[commit-bot: I haz the power, 2016-04-26 21:37:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1925463002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1925463002/1

[commit-bot: I haz the power, 2016-04-26 22:39:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-26 22:41:19]

Description was changed from

==========
Mojo: Make device/ to not rely on connecton error notification on message loop
destruction.

- Make device/usb to use StrongBinding wherever possible.
- Remove unnecessary DCHECK from DataSourceSender.

This is a preparation for removing connection error notification on message loop
destruction.

BUG=604762
==========

to

==========
Mojo: Make device/ to not rely on connecton error notification on message loop
destruction.

- Make device/usb to use StrongBinding wherever possible.
- Remove unnecessary DCHECK from DataSourceSender.

This is a preparation for removing connection error notification on message loop
destruction.

BUG=604762

Committed: https://crrev.com/0950cefe4e9c89fd11c4077123b9084c8173fdd9
Cr-Commit-Position: refs/heads/master@{#389926}
==========

[commit-bot: I haz the power, 2016-04-26 22:41:20]

Patchset 1 (id:??) landed as
https://crrev.com/0950cefe4e9c89fd11c4077123b9084c8173fdd9
Cr-Commit-Position: refs/heads/master@{#389926}