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

chrome/browser/ui/gtk/nine_box.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/nine_box.h"
 
 #include "base/basictypes.h"
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 157 matching lines @@
   cairo_destroy(cr);
 }
 
 void NineBox::RenderTopCenterStrip(cairo_t* cr, int x, int y,
                                    int width) const {
   const int height = gdk_pixbuf_get_height(images_[1]);
   TileImage(cr, images_[1], x, y, width, height, 1.0);
 }
 
 void NineBox::ContourWidget(GtkWidget* widget) const {
-  int width = widget->allocation.width;
-  int height = widget->allocation.height;
+  GtkAllocation allocation;
+  gtk_widget_get_allocation(widget, &allocation);
+  int width = allocation.width;
+  int height = allocation.height;
   int x1 = gdk_pixbuf_get_width(images_[0]);
   int x2 = width - gdk_pixbuf_get_width(images_[2]);
 
   // Paint the left and right sides.
   GdkBitmap* mask = gdk_pixmap_new(NULL, width, height, 1);
   gdk_pixbuf_render_threshold_alpha(images_[0], mask,
                                     0, 0,
                                     0, 0, -1, -1,
                                     1);
   gdk_pixbuf_render_threshold_alpha(images_[2], mask,
@@ skipping 28 matching lines @@
     cairo_paint(flipped_cr);
     cairo_destroy(flipped_cr);
 
     // Mask the widget.
     gtk_widget_shape_combine_mask(widget, flipped_mask, 0, 0);
     g_object_unref(flipped_mask);
   }
 
   g_object_unref(mask);
 }