[Chromoting] Fix broken OK/Cancel button in loading window.

[Chromoting] Fix broken OK/Cancel button in loading window.

The recent change to add jscompile annotations include a change that
breaks that default OK/Cancel button of the loading window (because
of the number -> string conversion).

This cl removes the conversion that was added and and updates the
type annotation for sendReply_ to address the jscompile warning.

NOTRY=True
BUG=

Committed: https://crrev.com/01fdbfdf971a9f1d61652bcc181cc4c6790bc79d
Cr-Commit-Position: refs/heads/master@{#313327}

[garykac, 2015-01-27 18:11:40]

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

[Jamie, 2015-01-27 19:42:52]

lgtm

[garykac, 2015-01-27 19:46:42]

The CQ bit was checked by garykac@chromium.org

[commit-bot: I haz the power, 2015-01-27 19:47:57]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/883813002/1

[commit-bot: I haz the power, 2015-01-27 19:49:14]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 19:50:19]

Patchset 1 (id:??) landed as
https://crrev.com/01fdbfdf971a9f1d61652bcc181cc4c6790bc79d
Cr-Commit-Position: refs/heads/master@{#313327}