Revert of Added Signin Utilities

Revert of Added Signin Utilities (patchset #21 id:390001 of https://codereview.chromium.org/1258563005/ )

Reason for revert:
Tests are failing: https://code.google.com/p/chromium/issues/detail?id=517849

Original issue's description:
> Tools for being able to sign into fake OS accounts and fake app accounts
> when running tests. Real OS accounts are also supported, but take
> significantly longer because accounts must be authenticated. It is
> recommended to use fake OS accounts unless real ones are necessary.
>
> CQ-DEPEND=CL:1259253007
>
> Committed: https://crrev.com/6832765af577d32c774763e5abe8486aa8db7478
> Cr-Commit-Position: refs/heads/master@{#342190}

TBR=mikecase@chromium.org,jbudorick@chromium.org,yfriedman@chromium.org,skirmani@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://crrev.com/ff13864f73ac781d885f68f98dd8c7a63d384675
Cr-Commit-Position: refs/heads/master@{#342333}

[Michael van Ouwerkerk, 2015-08-07 11:06:38]

Created Revert of Added Signin Utilities

[commit-bot: I haz the power, 2015-08-07 11:06:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1270423006/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1270423006/1

[commit-bot: I haz the power, 2015-08-07 11:07:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-07 11:07:49]

Patchset 1 (id:??) landed as
https://crrev.com/ff13864f73ac781d885f68f98dd8c7a63d384675
Cr-Commit-Position: refs/heads/master@{#342333}