GTK: Seal up GSEALs, focusing on GtkSelectionData.

content/browser/renderer_host/gtk_im_context_wrapper.cc

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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 "content/browser/renderer_host/gtk_im_context_wrapper.h"
 
 #include <gdk/gdk.h>
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
 #include <algorithm>
@@ skipping 570 matching lines @@
   gtk_im_context_set_surrounding(context, text.c_str(), text.length(),
       cursor_index);
 
   return TRUE;
 }
 
 void GtkIMContextWrapper::HandleHostViewRealize(GtkWidget* widget) {
   // We should only set im context's client window once, because when setting
   // client window.im context may destroy and recreate its internal states and
   // objects.
-  if (widget->window) {
-    gtk_im_context_set_client_window(context_, widget->window);
-    gtk_im_context_set_client_window(context_simple_, widget->window);
+  GdkWindow* gdk_window = gtk_widget_get_window(widget);
+  if (gdk_window) {
+    gtk_im_context_set_client_window(context_, gdk_window);
+    gtk_im_context_set_client_window(context_simple_, gdk_window);
   }
 }
 
 void GtkIMContextWrapper::HandleHostViewUnrealize() {
   gtk_im_context_set_client_window(context_, NULL);
   gtk_im_context_set_client_window(context_simple_, NULL);
 }
 
 void GtkIMContextWrapper::SendFakeCompositionKeyEvent(
     WebKit::WebInputEvent::Type type) {
@@ skipping 37 matching lines @@
 
 void GtkIMContextWrapper::HandleHostViewRealizeThunk(
     GtkWidget* widget, GtkIMContextWrapper* self) {
   self->HandleHostViewRealize(widget);
 }
 
 void GtkIMContextWrapper::HandleHostViewUnrealizeThunk(
     GtkWidget* widget, GtkIMContextWrapper* self) {
   self->HandleHostViewUnrealize();
 }