Smoother full-screen UX

We hook onMaximized so that if the user maximizes the window, it automatically full-screens. This allows us to get the same behaviour if the user double-clicks the title bar or uses some other OS shortcut to maximize the window as we get if they clicks the maximize button. However, it's not a particularly clean transition to full-screen mode, especially on Mac, and I suspect it's the root cause of the referenced bug (though I can't repro it). This CL simplifies the common case of maximizing via the window control, which gives a much smoother UX.

BUG=384678
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278199

[Jamie, 2014-06-18 00:48:59]

ptal

[Jamie, 2014-06-18 01:01:11]

Please CQ when ready.

[kelvinp, 2014-06-18 06:00:56]

lgtm

[kelvinp, 2014-06-18 06:01:16]

The CQ bit was checked by kelvinp@chromium.org

[commit-bot: I haz the power, 2014-06-18 06:03:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jamiewalch@chromium.org/338373004/20001

[commit-bot: I haz the power, 2014-06-18 06:03:05]

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

[commit-bot: I haz the power, 2014-06-18 06:03:05]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Jamie, 2014-06-18 16:52:45]

Can I get a committer LGTM please?

[weitao, 2014-06-18 16:58:27]

On 2014/06/18 16:52:45, Jamie wrote:
> Can I get a committer LGTM please?

LGTM

[Jamie, 2014-06-18 17:10:06]

The CQ bit was checked by jamiewalch@chromium.org

[commit-bot: I haz the power, 2014-06-18 17:10:44]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/jamiewalch@chromium.org/338373004/20001

[commit-bot: I haz the power, 2014-06-18 23:55:09]

Change committed as 278199