[Webapp Refactor] Implements Me2MeConnectFlow as an object.

[Webapp Refactor] Implements Me2MeConnectFlow as an object.

This CL encapsulates Me2MeConnectFlow as an object.
Ultimately, we would like to create an interface to abstract
connection, error handling on the It2MeFlow and the Me2MeFlow
on the desktop remoting end.

Summary of changes:
1. Move pairingInfo into remoting.Host.
2. Update the field names of remoting.pairingInfo to match
   storage keys.
3. Move code from crd_connect.js into Me2MeConnectFlow.

BUG=466406
Committed: https://crrev.com/4827d56c1339eea1a64601ed5ea44dc76d025486
Cr-Commit-Position: refs/heads/master@{#320832}

[kelvinp, 2015-03-13 22:07:34]

kelvinp@chromium.org changed reviewers:
+ jamiewalch@chromium.org

[kelvinp, 2015-03-13 22:12:06]

Patchset #1 (id:1) has been deleted

[kelvinp, 2015-03-13 22:17:47]

PTAL

[kelvinp, 2015-03-16 18:32:30]

Ping

[Jamie, 2015-03-16 20:48:10]

lgtm

[kelvinp, 2015-03-16 21:00:39]

The CQ bit was checked by kelvinp@chromium.org

[commit-bot: I haz the power, 2015-03-16 21:01:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1008003002/40001

[commit-bot: I haz the power, 2015-03-16 22:12:20]

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

[commit-bot: I haz the power, 2015-03-16 22:12:21]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[kelvinp, 2015-03-16 22:35:35]

The CQ bit was checked by kelvinp@chromium.org

[kelvinp, 2015-03-16 22:35:36]

The patchset sent to the CQ was uploaded after l-g-t-m from
jamiewalch@chromium.org
Link to the patchset: https://codereview.chromium.org/1008003002/#ps60001
(title: "Rebase")

[commit-bot: I haz the power, 2015-03-16 22:36:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1008003002/60001

[commit-bot: I haz the power, 2015-03-17 00:43:13]

Committed patchset #3 (id:60001)

[commit-bot: I haz the power, 2015-03-17 00:43:41]

Patchset 3 (id:??) landed as
https://crrev.com/4827d56c1339eea1a64601ed5ea44dc76d025486
Cr-Commit-Position: refs/heads/master@{#320832}