Revert of mus: Enable system modal windows

Revert of mus: Enable system modal windows (patchset #13 id:240001 of https://codereview.chromium.org/1818333002/ )

Reason for revert:
Cases crashes when running

mojo_runner mojo:mash_init then selecting a user.

ED::UnobserveWindow @ the top of the call stack.

Original issue's description:
> mus: Enable system modal windows
>
> When a modal window does not have a transient parent, it will be modal
> to the whole system.
>
> BUG=548402
>
> Committed: https://crrev.com/aad86d4a28e819ff7b1d6cef106c7d88da2d48aa
> Cr-Commit-Position: refs/heads/master@{#390963}

TBR=sky@chromium.org,mohsen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=548402
Committed: https://crrev.com/f0bc2797737fcc29f952ada285eaab16a7f8c21f
Cr-Commit-Position: refs/heads/master@{#391301}

[Ben Goodger (Google), 2016-05-03 17:22:26]

Created Revert of mus: Enable system modal windows

[commit-bot: I haz the power, 2016-05-03 17:23:25]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1949603002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1949603002/1

[commit-bot: I haz the power, 2016-05-03 17:32:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1949603002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1949603002/1

[commit-bot: I haz the power, 2016-05-03 18:02:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1949603002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1949603002/1

[commit-bot: I haz the power, 2016-05-03 18:17:58]

Description was changed from

==========
Revert of mus: Enable system modal windows (patchset #13 id:240001 of
https://codereview.chromium.org/1818333002/ )

Reason for revert:
Cases crashes when running

mojo_runner mojo:mash_init then selecting a user.

ED::UnobserveWindow @ the top of the call stack.

Original issue's description:
> mus: Enable system modal windows
> 
> When a modal window does not have a transient parent, it will be modal
> to the whole system.
> 
> BUG=548402
> 
> Committed: https://crrev.com/aad86d4a28e819ff7b1d6cef106c7d88da2d48aa
> Cr-Commit-Position: refs/heads/master@{#390963}

TBR=sky@chromium.org,mohsen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=548402
==========

to

==========
Revert of mus: Enable system modal windows (patchset #13 id:240001 of
https://codereview.chromium.org/1818333002/ )

Reason for revert:
Cases crashes when running

mojo_runner mojo:mash_init then selecting a user.

ED::UnobserveWindow @ the top of the call stack.

Original issue's description:
> mus: Enable system modal windows
> 
> When a modal window does not have a transient parent, it will be modal
> to the whole system.
> 
> BUG=548402
> 
> Committed: https://crrev.com/aad86d4a28e819ff7b1d6cef106c7d88da2d48aa
> Cr-Commit-Position: refs/heads/master@{#390963}

TBR=sky@chromium.org,mohsen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=548402
==========

[commit-bot: I haz the power, 2016-05-03 18:17:59]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-05-03 18:19:21]

Description was changed from

==========
Revert of mus: Enable system modal windows (patchset #13 id:240001 of
https://codereview.chromium.org/1818333002/ )

Reason for revert:
Cases crashes when running

mojo_runner mojo:mash_init then selecting a user.

ED::UnobserveWindow @ the top of the call stack.

Original issue's description:
> mus: Enable system modal windows
> 
> When a modal window does not have a transient parent, it will be modal
> to the whole system.
> 
> BUG=548402
> 
> Committed: https://crrev.com/aad86d4a28e819ff7b1d6cef106c7d88da2d48aa
> Cr-Commit-Position: refs/heads/master@{#390963}

TBR=sky@chromium.org,mohsen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=548402
==========

to

==========
Revert of mus: Enable system modal windows (patchset #13 id:240001 of
https://codereview.chromium.org/1818333002/ )

Reason for revert:
Cases crashes when running

mojo_runner mojo:mash_init then selecting a user.

ED::UnobserveWindow @ the top of the call stack.

Original issue's description:
> mus: Enable system modal windows
>
> When a modal window does not have a transient parent, it will be modal
> to the whole system.
>
> BUG=548402
>
> Committed: https://crrev.com/aad86d4a28e819ff7b1d6cef106c7d88da2d48aa
> Cr-Commit-Position: refs/heads/master@{#390963}

TBR=sky@chromium.org,mohsen@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=548402

Committed: https://crrev.com/f0bc2797737fcc29f952ada285eaab16a7f8c21f
Cr-Commit-Position: refs/heads/master@{#391301}
==========

[commit-bot: I haz the power, 2016-05-03 18:19:22]

Patchset 1 (id:??) landed as
https://crrev.com/f0bc2797737fcc29f952ada285eaab16a7f8c21f
Cr-Commit-Position: refs/heads/master@{#391301}