Revert of Add U2F request state machines

Revert of Add U2F request state machines (patchset #5 id:180001 of https://codereview.chromium.org/2821263005/ )

Reason for revert:
Reverting because U2fRequestTest.TestBasicMachine fails consistently on MSan bots (Linux MSan, Linux ChromiumOS MSan).

Original issue's description:
> Add U2F request state machines
> 
> U2fRequest base class is extended by each type of U2F
> request. Common functions of enumeration and device iteration
> are defined in the base class. U2fSign performs an entire
> sign request on any attached U2F devices, and U2FRegister
> performs the registration request on the devices.
> 
> BUG=686310
> 
> Review-Url: https://codereview.chromium.org/2821263005
> Cr-Commit-Position: refs/heads/master@{#466529}
> Committed: https://chromium.googlesource.com/chromium/src/+/892eb34117f811aa62c821c9129dc53110266e9a

TBR=reillyg@chromium.org,kpaulhamus@chromium.org,juanlang@chromium.org,piperc@google.com,piperc@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=686310
Review-Url: https://codereview.chromium.org/2838573002
Cr-Commit-Position: refs/heads/master@{#466666}
Committed: https://chromium.googlesource.com/chromium/src/+/80f6eac95d5a0b54894b1526ba505308efd5ab23

[pkalinnikov, 2017-04-24 11:49:34]

The CQ bit was checked by pkalinnikov@chromium.org

[pkalinnikov, 2017-04-24 11:49:35]

Created Revert of Add U2F request state machines

[commit-bot: I haz the power, 2017-04-24 11:49:49]

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, 2017-04-24 14:45:25]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-04-24 14:45:27]

Try jobs failed on following builders:
  linux_chromium_rel_ng on master.tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[pkalinnikov, 2017-04-24 14:46:05]

The CQ bit was checked by pkalinnikov@chromium.org

[commit-bot: I haz the power, 2017-04-24 14:46:30]

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, 2017-04-24 17:16:11]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1493045165658730, "parent_rev":
"0ceb99da2db1300e2392a827203d791e426c1b9b", "commit_rev":
"80f6eac95d5a0b54894b1526ba505308efd5ab23"}

[commit-bot: I haz the power, 2017-04-24 17:16:23]

Description was changed from

==========
Revert of Add U2F request state machines (patchset #5 id:180001 of
https://codereview.chromium.org/2821263005/ )

Reason for revert:
Reverting because U2fRequestTest.TestBasicMachine fails consistently on MSan
bots (Linux MSan, Linux ChromiumOS MSan).

Original issue's description:
> Add U2F request state machines
> 
> U2fRequest base class is extended by each type of U2F
> request. Common functions of enumeration and device iteration
> are defined in the base class. U2fSign performs an entire
> sign request on any attached U2F devices, and U2FRegister
> performs the registration request on the devices.
> 
> BUG=686310
> 
> Review-Url: https://codereview.chromium.org/2821263005
> Cr-Commit-Position: refs/heads/master@{#466529}
> Committed:
https://chromium.googlesource.com/chromium/src/+/892eb34117f811aa62c821c9129d...

TBR=reillyg@chromium.org,kpaulhamus@chromium.org,juanlang@chromium.org,piperc...
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=686310
==========

to

==========
Revert of Add U2F request state machines (patchset #5 id:180001 of
https://codereview.chromium.org/2821263005/ )

Reason for revert:
Reverting because U2fRequestTest.TestBasicMachine fails consistently on MSan
bots (Linux MSan, Linux ChromiumOS MSan).

Original issue's description:
> Add U2F request state machines
> 
> U2fRequest base class is extended by each type of U2F
> request. Common functions of enumeration and device iteration
> are defined in the base class. U2fSign performs an entire
> sign request on any attached U2F devices, and U2FRegister
> performs the registration request on the devices.
> 
> BUG=686310
> 
> Review-Url: https://codereview.chromium.org/2821263005
> Cr-Commit-Position: refs/heads/master@{#466529}
> Committed:
https://chromium.googlesource.com/chromium/src/+/892eb34117f811aa62c821c9129d...

TBR=reillyg@chromium.org,kpaulhamus@chromium.org,juanlang@chromium.org,piperc...
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=686310

Review-Url: https://codereview.chromium.org/2838573002
Cr-Commit-Position: refs/heads/master@{#466666}
Committed:
https://chromium.googlesource.com/chromium/src/+/80f6eac95d5a0b54894b1526ba50...
==========

[commit-bot: I haz the power, 2017-04-24 17:16:24]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/80f6eac95d5a0b54894b1526ba50...

[Casey Piper, 2017-04-24 20:53:57]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/2835133003/ by piperc@chromium.org.

The reason for reverting is: Missing initialized variable can be initialized and
this patchset can be merged again..