Nukes the windowmanager interface

Nukes the windowmanager interface

What was WindowManagerInternal* is now ViewManagerRoot*.

The initial bootstrap is:
. App connects to view_manager and asks for ViewManagerService.
. ViewManager asks this connection for ViewManagerClient, and calls
  OnEmbed.
. The ViewManager exposes the services ViewManagerRoot to the initial
  connection.

All of this is handled for you if you use ViewManagerInit.

As WindowManager is no more, Embed with just a url is lost. I'm
assuming you'll add that back.

BUG=487870
TEST=none
R=ben@chromium.org

Committed: https://crrev.com/6bf3a1ac1e2973e9ae382178f95fe153d021b20a
Cr-Commit-Position: refs/heads/master@{#329977}

[Ben Goodger (Google), 2015-05-14 22:54:11]

This is OK as an incremental improvement.

LGTM

[sky, 2015-05-14 22:58:13]

The CQ bit was checked by sky@chromium.org

[commit-bot: I haz the power, 2015-05-14 22:59:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1138073007/40001

[commit-bot: I haz the power, 2015-05-14 23:04:43]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-05-14 23:04:44]

Try jobs failed on following builders:
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[sky, 2015-05-14 23:19:38]

The CQ bit was checked by sky@chromium.org

[sky, 2015-05-14 23:19:39]

The patchset sent to the CQ was uploaded after l-g-t-m from ben@chromium.org
Link to the patchset: https://codereview.chromium.org/1138073007/#ps60001
(title: "merge")

[commit-bot: I haz the power, 2015-05-14 23:21:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1138073007/60001

[commit-bot: I haz the power, 2015-05-14 23:56:36]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2015-05-14 23:57:31]

Patchset 4 (id:??) landed as
https://crrev.com/6bf3a1ac1e2973e9ae382178f95fe153d021b20a
Cr-Commit-Position: refs/heads/master@{#329977}