Move html_viewer from mojo/services to components.

Move html_viewer from mojo/services to components.

BUG=479353
TBR=jochen for DEPS

Committed: https://crrev.com/81a5661f60738efa7dbbee0a72f2c1e15f6690f9
Cr-Commit-Position: refs/heads/master@{#326369}

[Elliot Glaysher, 2015-04-22 19:46:40]

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

[Elliot Glaysher, 2015-04-22 19:46:41]

file move lgtm

[jam, 2015-04-22 20:13:17]

The CQ bit was checked by jam@chromium.org

[jam, 2015-04-22 20:13:18]

The patchset sent to the CQ was uploaded after l-g-t-m from erg@chromium.org
Link to the patchset: https://codereview.chromium.org/1099303002/#ps20001
(title: "rebase")

[commit-bot: I haz the power, 2015-04-22 20:14:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1099303002/20001

[jam, 2015-04-22 20:27:53]

jam@chromium.org changed reviewers:
+ jochen@chromium.org

[commit-bot: I haz the power, 2015-04-22 20:38:26]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-22 20:39:56]

Patchset 2 (id:??) landed as
https://crrev.com/81a5661f60738efa7dbbee0a72f2c1e15f6690f9
Cr-Commit-Position: refs/heads/master@{#326369}