Have RenderWidgetHostViewGtk take ownership of its widget.

chrome/browser/renderer_host/render_widget_host_view_gtk.cc

 // Copyright (c) 2006-2008 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/renderer_host/render_widget_host_view_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdk.h>
 #include <cairo/cairo.h>
 
@@ skipping 118 matching lines @@
 // static
 RenderWidgetHostView* RenderWidgetHostView::CreateViewForWidget(
     RenderWidgetHost* widget) {
   return new RenderWidgetHostViewGtk(widget);
 }
 
 RenderWidgetHostViewGtk::RenderWidgetHostViewGtk(RenderWidgetHost* widget_host)
     : host_(widget_host) {
   host_->set_view(this);
   view_ = RenderWidgetHostViewGtkWidget::CreateNewWidget(this);
+  // BUG 8707: We will live in some container (in this case in WebContents).
+  // We want to destroy during Destroy(), independent of how we are managed in
+  // any containers.  We need to sink the reference here to "own" the widget so
+  // it can be added and removed from containers without being destroyed.
+  g_object_ref_sink(view_);
 }
 
 RenderWidgetHostViewGtk::~RenderWidgetHostViewGtk() {
 }
 
 void RenderWidgetHostViewGtk::DidBecomeSelected() {
   NOTIMPLEMENTED();
 }
 
 void RenderWidgetHostViewGtk::WasHidden() {
@@ skipping 138 matching lines @@
     // Destroy()ed yet and it receives paint messages...
     GdkWindow* window = view_->window;
     if (window) {
       backing_store->ShowRect(
           damage_rect, x11_util::GetX11WindowFromGtkWidget(view_));
     }
   } else {
     NOTIMPLEMENTED();
   }
 }