Factor out uses of WebContentsModalDialog interface functions from WebContentsModalDialogManager

chrome/browser/ui/gtk/constrained_window_gtk.cc

Index: chrome/browser/ui/gtk/constrained_window_gtk.cc
diff --git a/chrome/browser/ui/gtk/constrained_window_gtk.cc b/chrome/browser/ui/gtk/constrained_window_gtk.cc
index 1b1b47498665a5eb7609bd8647ac7accf16f5942..e35764e7928ebec9bfc3b7e2e5e4316d20b59763 100644
--- a/chrome/browser/ui/gtk/constrained_window_gtk.cc
+++ b/chrome/browser/ui/gtk/constrained_window_gtk.cc
@@ -73,6 +73,11 @@ ConstrainedWindowGtk::ConstrainedWindowGtk(
   g_signal_connect(widget(), "hierarchy-changed",
                    G_CALLBACK(OnHierarchyChangedThunk), this);
 
+  // TODO(wittman): Getting/setting data on the widget is a hack to facilitate
+  // looking up the ConstrainedWindowGtk from the GtkWindow during refactoring.
+  // Remove once ConstrainedWindowGtk is gone.
+  g_object_set_data(G_OBJECT(widget()), "ConstrainedWindowGtk", this);
+
   WebContentsModalDialogManager* web_contents_modal_dialog_manager =
       WebContentsModalDialogManager::FromWebContents(web_contents_);
   web_contents_modal_dialog_manager->AddDialog(this);