Update Media Router WebUI JSDocs.

Update Media Router WebUI JSDocs.

- Use @return instead of @return in media-router-container.
- Move function comments into JSDoc @return in issue-banner.

Committed: https://crrev.com/a719b2b6e63d2bc558db5392934de984fcd91e8c
Cr-Commit-Position: refs/heads/master@{#331922}

[apacible, 2015-05-27 22:29:23]

apacible@chromium.org changed reviewers:
+ mfoltz@chromium.org

[apacible, 2015-05-27 23:31:52]

PTAL, thanks!

[mark a. foltz, 2015-05-28 23:43:31]

lgtm

[apacible, 2015-05-29 00:52:08]

The CQ bit was checked by apacible@chromium.org

[commit-bot: I haz the power, 2015-05-29 00:53:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1160443003/1

[commit-bot: I haz the power, 2015-05-29 01:56:58]

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

[commit-bot: I haz the power, 2015-05-29 01:56:58]

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_...)

[apacible, 2015-05-29 02:57:48]

The CQ bit was checked by apacible@chromium.org

[apacible, 2015-05-29 02:57:49]

The patchset sent to the CQ was uploaded after l-g-t-m from mfoltz@chromium.org
Link to the patchset: https://codereview.chromium.org/1160443003/#ps20001
(title: "Rebase.")

[commit-bot: I haz the power, 2015-05-29 02:57:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1160443003/20001

[commit-bot: I haz the power, 2015-05-29 04:05:00]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-29 04:05:56]

Patchset 2 (id:??) landed as
https://crrev.com/a719b2b6e63d2bc558db5392934de984fcd91e8c
Cr-Commit-Position: refs/heads/master@{#331922}