WindowDataMap doesn't remove data objects for closed windows. b=495710 r=smichaud r=josh

      // we want to unhook the delegate here because we don't want events

      // sent to it after this object has been destroyed

      [mWindow setDelegate:nil];

      [mWindow autorelease];

      [mWindow close];

      [mDelegate autorelease];

    }

  }

    [mWindow setBackgroundColor:[NSColor whiteColor]];

    [mWindow setContentMinSize:NSMakeSize(60, 60)];

    [mWindow setReleasedWhenClosed:NO];

    // setup our notification delegate. Note that setDelegate: does NOT retain.

    mDelegate = [[WindowDelegate alloc] initWithGeckoWindow:this];