GTK: More removal of raw GtkWidget->allocation access.

chrome/browser/ui/gtk/extensions/extension_popup_gtk.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/gtk/extensions/extension_popup_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <algorithm>
 
@@ skipping 160 matching lines @@
                             !being_inspected_,  // grab_input
                             GtkThemeService::GetFrom(browser_->profile()),
                             this);
 }
 
 void ExtensionPopupGtk::DestroyPopupWithoutResult() {
   DestroyPopup();
 }
 
 gfx::Rect ExtensionPopupGtk::GetViewBounds() {
-  return gfx::Rect(host_->view()->native_view()->allocation);
+  GtkAllocation allocation;
+  gtk_widget_get_allocation(host_->view()->native_view(), &allocation);
+  return gfx::Rect(allocation);
 }