[Chromoting] Remove initIdentityEmail.

[Chromoting] Remove initIdentityEmail.

No longer being used in CRD since we've switched to initIdentityUserInfo.
This cl removes the remaining identity/email functions since all apps are
now using the userinfo versions.

* Removes initIdentityEmail since it is no longer being used
* Replaces onEmailAvailable (crd_main.js) with onUserInfoAvailable (desktop_remoting.js)
* Folds initIdentityUserInfo into initIdentity since it is now being used by all apps (CRD and AR).

NOTRY=True
BUG=444175
R=weitaosu@chromium.org

Committed: https://chromium.googlesource.com/chromium/src/+/c25636e6d76327ad61b6a561c4ca8805ef130984

[garykac, 2014-12-19 23:46:06]

garykac@chromium.org changed reviewers:
+ weitaosu@chromium.org

[weitao, 2014-12-20 00:01:16]

LGTM

[commit-bot: I haz the power, 2014-12-20 00:28:26]

Patchset 2 (id:??) landed as
https://crrev.com/c25636e6d76327ad61b6a561c4ca8805ef130984
Cr-Commit-Position: refs/heads/master@{#309308}

[garykac, 2014-12-20 00:28:45]

Committed patchset #2 (id:20001) manually as
c25636e6d76327ad61b6a561c4ca8805ef130984 (presubmit successful).