[chrome.displaySource] Fix service impl constructors.

[chrome.displaySource] Fix service impl constructors.

This CL completes changes constructor declarations by changing
definitions accordingly. This also avoid external calls to private
constructors.

BUG=242107
Committed: https://crrev.com/ed168b3b8f34db55dc91d279e779e428e506a856
Cr-Commit-Position: refs/heads/master@{#419725}

[e_hakkinen, 2016-09-20 10:10:43]

eero.hakkinen@intel.com changed reviewers:
+ alexander.shalamov@intel.com, mikhail.pozdnyakov@intel.com

[e_hakkinen, 2016-09-20 10:10:43]

PTAL.

[Mikhail, 2016-09-20 11:22:46]

lgtm

[e_hakkinen, 2016-09-20 11:48:33]

The CQ bit was checked by eero.hakkinen@intel.com

[commit-bot: I haz the power, 2016-09-20 11:48:53]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-20 12:26:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-20 12:29:21]

Description was changed from

==========
[chrome.displaySource] Fix service impl constructors.

This CL completes changes constructor declarations by changing
definitions accordingly. This also avoid external calls to private
constructors.

BUG=242107
==========

to

==========
[chrome.displaySource] Fix service impl constructors.

This CL completes changes constructor declarations by changing
definitions accordingly. This also avoid external calls to private
constructors.

BUG=242107

Committed: https://crrev.com/ed168b3b8f34db55dc91d279e779e428e506a856
Cr-Commit-Position: refs/heads/master@{#419725}
==========

[commit-bot: I haz the power, 2016-09-20 12:29:22]

Patchset 1 (id:??) landed as
https://crrev.com/ed168b3b8f34db55dc91d279e779e428e506a856
Cr-Commit-Position: refs/heads/master@{#419725}