Convert *.css files to *_style.html files for the following custom elements: date_time_page, setting

Convert *.css files to *_style.html files for the following custom elements: date_time_page, settings_drawer, settings_main, settings_menu, settings_page_header, and settings_ui. See http://goo.gl/vIGSCO for more information.

BUG=477154
Committed: https://crrev.com/3ba1fe2ec13702f1ebf7294f798f73a158d0578f
Cr-Commit-Position: refs/heads/master@{#325353}

[Kyle Horimoto, 2015-04-15 18:21:43]

khorimoto@chromium.org changed reviewers:
+ michaelpg@chromium.org

[michaelpg, 2015-04-15 19:09:13]

These changes are rote and trivial now that we've nailed down the pattern. Could
you batch the changes into one CL?

[Kyle Horimoto, 2015-04-15 22:26:09]

On 2015/04/15 19:09:13, michaelpg wrote:
> These changes are rote and trivial now that we've nailed down the pattern.
Could
> you batch the changes into one CL?

Done - PTAL.

[michaelpg, 2015-04-15 22:52:26]

LGTM! Just update the title.

[Kyle Horimoto, 2015-04-15 22:53:18]

The CQ bit was checked by khorimoto@chromium.org

[commit-bot: I haz the power, 2015-04-15 22:54:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1051763004/40001

[commit-bot: I haz the power, 2015-04-16 00:04:49]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-04-16 00:06:33]

Patchset 3 (id:??) landed as
https://crrev.com/3ba1fe2ec13702f1ebf7294f798f73a158d0578f
Cr-Commit-Position: refs/heads/master@{#325353}