Settings Rewrite: Restore id of default id to 'main' from ''.

Settings Rewrite: Restore id of default id to 'main' from ''.

Previously, the default subpage was marked as:

<neon-animatable id="">
  ...
</neon-animatable>

However, this is confusing. This patch changes the default subpage to:

<neon-animatable id="main">
  ...
</neon-animatable>

BUG=535013
Committed: https://crrev.com/88b850da08e4e919c8b1171003ad4e532d858aba
Cr-Commit-Position: refs/heads/master@{#352438}

[tommycli, 2015-10-05 18:46:22]

tommycli@chromium.org changed reviewers:
+ dschuyler@chromium.org

[tommycli, 2015-10-05 18:46:23]

dschuyler: PTAL, thanks!

[Dan Beam, 2015-10-05 18:50:43]

dbeam@chromium.org changed reviewers:
+ dbeam@chromium.org

[Dan Beam, 2015-10-05 18:50:44]

lgtm

[dschuyler, 2015-10-05 20:18:10]

On 2015/10/05 18:50:44, Dan Beam wrote:
> lgtm

lgtm

[tommycli, 2015-10-05 20:49:45]

The CQ bit was checked by tommycli@chromium.org

[commit-bot: I haz the power, 2015-10-05 20:50:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1374563010/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1374563010/20001

[commit-bot: I haz the power, 2015-10-05 21:51:43]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-10-05 21:52:31]

Patchset 2 (id:??) landed as
https://crrev.com/88b850da08e4e919c8b1171003ad4e532d858aba
Cr-Commit-Position: refs/heads/master@{#352438}