Remove use of mojo.SurfacesService interface in html_viewer

Remove use of mojo.SurfacesService interface in html_viewer

I'm planning to remove this interface in favor of connecting directly
to mojo.Surface in the mojo repo, this updates html_viewer so it will
still work after the removal.

Committed: https://crrev.com/7971a8963de8fa6db33d5f0c9dab91f41b61b9bd
Cr-Commit-Position: refs/heads/master@{#313858}

[jamesr, 2015-01-30 01:28:48]

jamesr@chromium.org changed reviewers:
+ rockot@chromium.org

[Ken Rockot(use gerrit already), 2015-01-30 01:48:43]

lgtm

[jamesr, 2015-01-30 02:13:19]

The CQ bit was checked by jamesr@chromium.org

[commit-bot: I haz the power, 2015-01-30 02:14:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/869343004/1

[commit-bot: I haz the power, 2015-01-30 02:18:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-30 02:19:25]

Patchset 1 (id:??) landed as
https://crrev.com/7971a8963de8fa6db33d5f0c9dab91f41b61b9bd
Cr-Commit-Position: refs/heads/master@{#313858}