Simplify collections.js now that it's wrapped in an IIFE

Simplify collections.js now that it's wrapped in an IIFE

Also wrap templates.js in an IIFE to avoid unnecessary pollution
of the builtins object.

Committed: https://crrev.com/f089e5c8467047a1571ecbbfc5556a7e619c6b1d
Cr-Commit-Position: refs/heads/master@{#27638}

[adamk, 2015-04-07 18:38:59]

adamk@chromium.org changed reviewers:
+ arv@chromium.org

[arv (Not doing code reviews), 2015-04-07 18:41:01]

LGTM

[adamk, 2015-04-07 18:41:50]

The CQ bit was checked by adamk@chromium.org

[commit-bot: I haz the power, 2015-04-07 18:42:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1067903004/1

[commit-bot: I haz the power, 2015-04-07 19:00:41]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-07 19:00:52]

Patchset 1 (id:??) landed as
https://crrev.com/f089e5c8467047a1571ecbbfc5556a7e619c6b1d
Cr-Commit-Position: refs/heads/master@{#27638}