Attempt at fixing crash. I believe this is happening during session...

Attempt at fixing crash. I believe this is happening during session
end, which has a different shutdown path and is possible for the model
to be deleted before the view.

I'm also adding checking to XPFrame/VistaFrame to make sure the
BookmarkBarView doesn't have a parent in the destructor. This
shouldn't be possible, but I'm adding the check to be sure;)

BUG=1359852
TEST=make sure you don't see problems with bookmarks


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=1754

[Ben Goodger (Google), 2008-09-04 22:44:44]

LG