Remove getCached* methods from remoting.Identity.

Remove getCached* methods from remoting.Identity.

These methods were introduced before Promises were implemented to simplify
code that just needs an email address but wouldn't otherwise need to be
written asynchronously. With Promises, asynchronous code reads a lot more
naturally, and it's less of a concern.

Having explicit accessors for cached state means that there needs to be
some (asynchronous) initialization code to save them, which complicates
some of the changes I'm planning on making to application start-up. The
simplest fix is eliminate them altogether and make all the call-sites
asynchronous.

Committed: https://crrev.com/7b6ab410b0665dcb84c2818f4453b36f2c5a1e36
Cr-Commit-Position: refs/heads/master@{#318794}

[Jamie, 2015-02-28 01:40:25]

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

[Jamie, 2015-02-28 01:40:26]

PTAL

[kelvinp, 2015-03-02 19:05:46]

lgtm

[Jamie, 2015-03-02 19:07:56]

The CQ bit was checked by jamiewalch@chromium.org

[commit-bot: I haz the power, 2015-03-02 19:09:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/963103004/20001

[commit-bot: I haz the power, 2015-03-02 20:14:47]

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

[commit-bot: I haz the power, 2015-03-02 20:14:48]

Try jobs failed on following builders:
  linux_chromium_compile_dbg_32_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[Jamie, 2015-03-02 22:22:11]

The CQ bit was checked by jamiewalch@chromium.org

[Jamie, 2015-03-02 22:22:11]

The patchset sent to the CQ was uploaded after l-g-t-m from kelvinp@chromium.org
Link to the patchset: https://codereview.chromium.org/963103004/#ps40001 (title:
"Rebase and jscompile fixes.")

[commit-bot: I haz the power, 2015-03-02 22:24:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/963103004/40001

[commit-bot: I haz the power, 2015-03-02 23:11:47]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-03-02 23:12:33]

Patchset 3 (id:??) landed as
https://crrev.com/7b6ab410b0665dcb84c2818f4453b36f2c5a1e36
Cr-Commit-Position: refs/heads/master@{#318794}