content: Move render_widget_host_view_gtk to content/

chrome/browser/ui/gtk/owned_widget_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/owned_widget_gtk.h"
-
-#include <gtk/gtk.h>
-
-#include "base/logging.h"
-
-OwnedWidgetGtk::~OwnedWidgetGtk() {
-  Destroy();
-}
-
-void OwnedWidgetGtk::Own(GtkWidget* widget) {
-  if (!widget)
-    return;
-
-  DCHECK(!widget_);
-  // We want to make sure that Own() was called properly, right after the
-  // widget was created. There should be a floating reference.
-  DCHECK(g_object_is_floating(widget));
-
-  // Sink the floating reference, we should now own this reference.
-  g_object_ref_sink(widget);
-  widget_ = widget;
-}
-
-void OwnedWidgetGtk::Destroy() {
-  if (!widget_)
-    return;
-
-  GtkWidget* widget = widget_;
-  widget_ = NULL;
-  gtk_widget_destroy(widget);
-
-  DCHECK(!g_object_is_floating(widget));
-  // NOTE: Assumes some implementation details about glib internals.
-  DCHECK_EQ(G_OBJECT(widget)->ref_count, 1U);
-  g_object_unref(widget);
-}