Revert of Replace PO2TS::GetPrimaryAccountId() with SMB::GetAuthenticatedAccountId.

Revert of Replace PO2TS::GetPrimaryAccountId() with SMB::GetAuthenticatedAccountId. (https://codereview.chromium.org/150003004/)

Reason for revert:
http://build.chromium.org/p/chromium.linux/builders/Linux%20GTK%20Builder/builds/497

Original issue's description:
> Replace PO2TS::GetPrimaryAccountId() with SMB::GetAuthenticatedAccountId.
> 
> The functionality is the same, just moving the code to a new place.
> 
> NOTRY=True
> BUG=333995
> R=bauerb@chromium.org, brettw@chromium.org, joaodasilva@chromium.org, nhiroki@chromium.org, noms@chromium.org, rlarocque@chromium.org
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251221

TBR=joaodasilva@chromium.org,noms@chromium.org,bauerb@chromium.org,rlarocque@chromium.org,sky@chromium.org,nhiroki@chromium.org,brettw@chromium.org,rogerta@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=333995
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=251228

[hubbe, 2014-02-14 01:44:29]

Created Revert of Replace PO2TS::GetPrimaryAccountId() with
SMB::GetAuthenticatedAccountId.

[commit-bot: I haz the power, 2014-02-14 01:46:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/hubbe@chromium.org/165543004/1

[commit-bot: I haz the power, 2014-02-14 01:51:34]

Change committed as 251228