[Mac] Get theme providers from a window's delegate, not its window controller...

[Mac] Get theme providers from a window's delegate, not its window controller.  These are actually the same object, but they are set at different times during the switch to fullscreen.

BUG=39323
TEST=Go fullscreen with the Android Robot theme installed.  Tab text for unselected tabs should be grey, not black.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=43708

[rohitrao (ping after 24h), 2010-04-05 23:07:56]

So this change will fix the problem, but I'm very Meh about it.

In the setFullscreen: code, we change the delegates before adding the views
back, but we do not change the window controller until after all the views are
in place.  The delegate is actually just the window controller, so this is
really only a change in how we access it.

I'm hoping I can clean up the code enough that I'll be able to set the window
controller at the same time as the delegate.  Right now we're crashing, but I
think that may be because of a stray notification registration.

On the other hand, if I can't clean things up, this solution will start to look
better and better.  At a very high level, do you think theme providers are a job
for a window's controller or a window's delegate?

[Avi (use Gerrit), 2010-04-05 23:11:18]

LGTM

I'm totally OK with considering the delegate as the source of pixels rather than
the controller. Perhaps I'm a bit more pragmatic than you are, but if they're
the same thing, does it really matter? :)