mus: Remove window server access to clipboard and the drag clipboard.

mus: Remove window server access to clipboard and the drag clipboard.

This reverts 7d6c8b29f6, which made window server have access to the
clipboard, as at the time, I thought that drag and drop would read/write
to/from a dedicated drag clipboard and that the window server would have
to manipulate it. Due to timing issues, this didn't work out.

Now that we aren't using a drag clipboard as the backing for mus drag
and drop, also remove the drag clipboard from our mus clipboard
implementation.

BUG=614037
Committed: https://crrev.com/98ef46cc289b9cb95cccfb7db520e73ac66b0dc2
Cr-Commit-Position: refs/heads/master@{#419260}

[Elliot Glaysher, 2016-09-15 22:44:47]

The CQ bit was checked by erg@chromium.org to run a CQ dry run

[Elliot Glaysher, 2016-09-15 22:45:04]

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

[Elliot Glaysher, 2016-09-15 22:45:04]

Some cleanup now that the main patch is done.

[commit-bot: I haz the power, 2016-09-15 22:45:15]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[sky, 2016-09-15 23:04:53]

LGTM

[Elliot Glaysher, 2016-09-15 23:19:41]

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

[Elliot Glaysher, 2016-09-15 23:19:42]

+tsepez for trivial mojo change

[commit-bot: I haz the power, 2016-09-15 23:53:24]

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

[commit-bot: I haz the power, 2016-09-15 23:53:24]

Dry run: This issue passed the CQ dry run.

[Tom Sepez, 2016-09-16 19:50:46]

Trivial mojom LGTM

[Elliot Glaysher, 2016-09-16 19:52:05]

The CQ bit was checked by erg@chromium.org

[commit-bot: I haz the power, 2016-09-16 19:52:37]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-16 19:59:13]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-09-16 20:02:34]

Description was changed from

==========
mus: Remove window server access to clipboard and the drag clipboard.

This reverts 7d6c8b29f6, which made window server have access to the
clipboard, as at the time, I thought that drag and drop would read/write
to/from a dedicated drag clipboard and that the window server would have
to manipulate it. Due to timing issues, this didn't work out.

Now that we aren't using a drag clipboard as the backing for mus drag
and drop, also remove the drag clipboard from our mus clipboard
implementation.

BUG=614037
==========

to

==========
mus: Remove window server access to clipboard and the drag clipboard.

This reverts 7d6c8b29f6, which made window server have access to the
clipboard, as at the time, I thought that drag and drop would read/write
to/from a dedicated drag clipboard and that the window server would have
to manipulate it. Due to timing issues, this didn't work out.

Now that we aren't using a drag clipboard as the backing for mus drag
and drop, also remove the drag clipboard from our mus clipboard
implementation.

BUG=614037

Committed: https://crrev.com/98ef46cc289b9cb95cccfb7db520e73ac66b0dc2
Cr-Commit-Position: refs/heads/master@{#419260}
==========

[commit-bot: I haz the power, 2016-09-16 20:02:35]

Patchset 1 (id:??) landed as
https://crrev.com/98ef46cc289b9cb95cccfb7db520e73ac66b0dc2
Cr-Commit-Position: refs/heads/master@{#419260}