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

chrome/browser/ui/gtk/notifications/balloon_view_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/notifications/balloon_view_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include <string>
 #include <vector>
@@ skipping 399 matching lines @@
 
 // We draw black dots on the bottom left and right corners to fill in the
 // border. Otherwise, the border has a gap because the sharp corners of the
 // HTML view cut off the roundedness of the notification window.
 gboolean BalloonViewImpl::OnContentsExpose(GtkWidget* sender,
                                            GdkEventExpose* event) {
   cairo_t* cr = gdk_cairo_create(GDK_DRAWABLE(sender->window));
   gdk_cairo_rectangle(cr, &event->area);
   cairo_clip(cr);
 
+  GtkAllocation allocation;
+  gtk_widget_get_allocation(sender, &allocation);
+
   // According to a discussion on a mailing list I found, these degenerate
   // paths are the officially supported way to draw points in Cairo.
   cairo_set_source_rgb(cr, 0, 0, 0);
   cairo_set_line_cap(cr, CAIRO_LINE_CAP_ROUND);
   cairo_set_line_width(cr, 1.0);
-  cairo_move_to(cr, 0.5, sender->allocation.height - 0.5);
+  cairo_move_to(cr, 0.5, allocation.height - 0.5);
   cairo_close_path(cr);
-  cairo_move_to(cr, sender->allocation.width - 0.5,
-                    sender->allocation.height - 0.5);
+  cairo_move_to(cr, allocation.width - 0.5, allocation.height - 0.5);
   cairo_close_path(cr);
   cairo_stroke(cr);
   cairo_destroy(cr);
 
   return FALSE;
 }
 
 gboolean BalloonViewImpl::OnExpose(GtkWidget* sender, GdkEventExpose* event) {
   cairo_t* cr = gdk_cairo_create(GDK_DRAWABLE(sender->window));
   gdk_cairo_rectangle(cr, &event->area);
@@ skipping 38 matching lines @@
                    weak_factory_.GetWeakPtr(),
                    false));
   }
 }
 
 gboolean BalloonViewImpl::OnDestroy(GtkWidget* widget) {
   frame_container_ = NULL;
   Close(false);
   return FALSE;  // Propagate.
 }