GTK: Even more cleanup to access allocation through the accessor.

chrome/browser/ui/gtk/location_bar_view_gtk.cc

Index: chrome/browser/ui/gtk/location_bar_view_gtk.cc
diff --git a/chrome/browser/ui/gtk/location_bar_view_gtk.cc b/chrome/browser/ui/gtk/location_bar_view_gtk.cc
index 72960662557047a3ab96d644fb7abc175db58885..18139c707a2150f2a55e3fd1cda7708d608eeab9 100644
--- a/chrome/browser/ui/gtk/location_bar_view_gtk.cc
+++ b/chrome/browser/ui/gtk/location_bar_view_gtk.cc
@@ -1389,7 +1389,9 @@ gboolean LocationBarViewGtk::ContentSettingImageViewGtk::OnExpose(
   if (!(animation_.IsShowing() || animation_.IsClosing()))
     return FALSE;
 
-  const int height = sender->allocation.height;
+  GtkAllocation allocation;
+  gtk_widget_get_allocation(sender, &allocation);
+  const int height = allocation.height;
 
   cairo_t* cr = gdk_cairo_create(GDK_DRAWABLE(sender->window));
   gdk_cairo_rectangle(cr, &event->area);