Adds gtk_util::ParentWindow to find the parent window of a GtkWidget....

chrome/common/gtk_util.h

Index: chrome/common/gtk_util.h
===================================================================
--- chrome/common/gtk_util.h	(revision 17002)
+++ chrome/common/gtk_util.h	(working copy)
@@ -44,6 +44,10 @@
 // Initialize some GTK settings so that our dialogs are consistent.
 void InitRCStyles();
 
+// Returns the first ancestor of |widget|, starting a |widget| that is a window.

[agl, 2009/05/27 20:30:07]

This comment doesn't parse for me, maybe a word is missing. Also, 'Window' in
the GTK sense is different. I think you mean "toplevel window":

// Return the closest ancestor of |widget| which is a top level window or NULL
is such an ancestor doesn't exist.

+// If |widget| does not a window ancestor, NULL is returned.
+GtkWindow* ParentWindow(GtkWidget* widget);
+
 }  // namespace gtk_util
 
 #endif  // CHROME_COMMON_GTK_UTIL_H_