Revert of [Sync] Move data type logic from PSSA to PSS.

Revert of [Sync] Move data type logic from PSSA to PSS. (patchset #6 id:100001 of https://codereview.chromium.org/1304933010/ )

Reason for revert:
broke sync instrumentation tests: http://build.chromium.org/p/chromium.linux/builders/Android%20Tests/builds/22408

Original issue's description:
> [Sync] Move data type logic from PSSA to PSS.
>
> Now PSS::OnUserChoseDatatypes filters to only user selectable types,
> and GetPreferredDataTypes() will always include the control types.
>
> BUG=497518
>
> Committed: https://crrev.com/0f5131e4f6ae03647aae0cac8154bf888b844e95
> Cr-Commit-Position: refs/heads/master@{#350230}

TBR=zea@chromium.org,maxbogue@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=497518
Committed: https://crrev.com/121c0328c09332f88713ddf0691e71ee00798002
Cr-Commit-Position: refs/heads/master@{#350295}

[jbudorick, 2015-09-23 03:57:57]

Created Revert of [Sync] Move data type logic from PSSA to PSS.

[commit-bot: I haz the power, 2015-09-23 03:58:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1363803002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1363803002/1

[commit-bot: I haz the power, 2015-09-23 03:59:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-23 04:00:37]

Patchset 1 (id:??) landed as
https://crrev.com/121c0328c09332f88713ddf0691e71ee00798002
Cr-Commit-Position: refs/heads/master@{#350295}