Revert of Refactor browser side navigator.connect code to not use MessagePortService.

Revert of Refactor browser side navigator.connect code to not use MessagePortService. (patchset #2 id:60001 of https://codereview.chromium.org/1224263007/ )

Reason for revert:
Seems to be crashing on windows.

BUG=517281
Original issue's description:
> Refactor browser side navigator.connect code to not use MessagePortService.
>
> This is the first step towards unifying client side and service side ServicePort
> instances, but also removes a layer of abstraction in how connections to
> services are setup. The abstraction layer will probably later be reintroduced
> differently.
>
> BUG=426458
>
> Committed: https://crrev.com/9b053ed8f7b8893ad0a5a33d31546c70563ddf20
> Cr-Commit-Position: refs/heads/master@{#341987}

TBR=avi@chromium.org,bsittler@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=426458
Committed: https://crrev.com/f4acab417af4a182dbbb6bbc5aa1235662a9253c
Cr-Commit-Position: refs/heads/master@{#342026}

[Marijn Kruisselbrink, 2015-08-06 00:29:06]

Created Revert of Refactor browser side navigator.connect code to not use
MessagePortService.

[commit-bot: I haz the power, 2015-08-06 00:29:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1278483004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1278483004/1

[commit-bot: I haz the power, 2015-08-06 00:30:49]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-06 00:31:40]

Patchset 1 (id:??) landed as
https://crrev.com/f4acab417af4a182dbbb6bbc5aa1235662a9253c
Cr-Commit-Position: refs/heads/master@{#342026}