[Media Router WebUI] Rename close route event in html

[Media Router WebUI] Rename close route event in html

The event name used in media_router_container.html for closing routes
was not renamed by the previous change.

BUG=614144
NOTRY=true
NOPRESUBMIT=true

Review-Url: https://codereview.chromium.org/2036383002
Cr-Commit-Position: refs/heads/master@{#397792}
(cherry picked from commit e3c5d24288f9029a7ef82d6892f9d9afbb4fc607)

[btolsch, 2016-06-13 23:15:40]

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

[btolsch, 2016-06-13 23:15:41]

Merging to M52, no conflicts. PTAL, thanks!

[apacible, 2016-06-13 23:36:34]

rs lgtm

[btolsch, 2016-06-13 23:45:29]

The CQ bit was checked by btolsch@chromium.org

[commit-bot: I haz the power, 2016-06-13 23:46:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2061043002/1

[commit-bot: I haz the power, 2016-06-13 23:49:42]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-13 23:50:08]

CQ bit was unchecked