Allow all app windows to minimize.

Allow all app windows to minimize.

On CrOS, app windows can already be minimized by clicking their icon in the
taskbar. This just makes them show a minimize button as well.

On Windows, we prevent minimize if the window can't maximize, which
doesn't really make sense. They will now be able to minimize and show a
minimize button.

On Mac and Linux they could always minimize.

BUG=351179
Committed: https://crrev.com/7eb02c28e1859fff329ad68d2e5970315366b28f
Cr-Commit-Position: refs/heads/master@{#296437}

[jackhou1, 2014-09-24 11:19:25]

jackhou@chromium.org changed reviewers:
+ pkotwicz@chromium.org

[jackhou1, 2014-09-24 11:19:25]

pkotwicz, could you take a look since you have context from the earlier CL
(https://codereview.chromium.org/553333007/)

[pkotwicz, 2014-09-24 13:43:29]

LGTM

[jackhou1, 2014-09-24 16:35:15]

The CQ bit was checked by jackhou@chromium.org

[commit-bot: I haz the power, 2014-09-24 16:35:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/603523002/1

[commit-bot: I haz the power, 2014-09-24 16:41:10]

Committed patchset #1 (id:1) as b2ed6af7a14ce33bcc381a3b0f5b8a04340b1180

[commit-bot: I haz the power, 2014-09-24 16:41:48]

Patchset 1 (id:??) landed as
https://crrev.com/7eb02c28e1859fff329ad68d2e5970315366b28f
Cr-Commit-Position: refs/heads/master@{#296437}