[Ozone-Dri] Merge the DriWindowDelegate with the implementation

[Ozone-Dri] Merge the DriWindowDelegate with the implementation

Simplify code by removing an interface only used in testing.

BUG=none

Committed: https://crrev.com/2941af41fb7cfee4ca57388e410f9838ac5c0b26
Cr-Commit-Position: refs/heads/master@{#319160}

[dnicoara, 2015-03-04 20:41:03]

dnicoara@chromium.org changed reviewers:
+ spang@chromium.org

[dnicoara, 2015-03-04 20:41:03]

PTAL

I was going to do this after moving and renaming all the files, but since you've
mentioned it, here it is.

[spang, 2015-03-04 20:42:37]

lgtm

[dnicoara, 2015-03-04 22:32:00]

The CQ bit was checked by dnicoara@chromium.org

[commit-bot: I haz the power, 2015-03-04 22:42:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/981583005/1

[commit-bot: I haz the power, 2015-03-04 23:22:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 23:23:04]

Patchset 1 (id:??) landed as
https://crrev.com/2941af41fb7cfee4ca57388e410f9838ac5c0b26
Cr-Commit-Position: refs/heads/master@{#319160}