Lands http://codereview.chromium.org/2928005/ for Dill:

ui/base/models/menu_model.h

Index: ui/base/models/menu_model.h
diff --git a/ui/base/models/menu_model.h b/ui/base/models/menu_model.h
index d838a56297e69ec2efdd90edd1e7123d851cff5a..9734162f32ba82e58416a033ff3dd6c99d8a3196 100644
--- a/ui/base/models/menu_model.h
+++ b/ui/base/models/menu_model.h
@@ -8,6 +8,7 @@
 
 #include "base/scoped_ptr.h"
 #include "base/string16.h"
+#include "ui/base/models/menu_model_delegate.h"
 #include "ui/gfx/native_widget_types.h"
 
 class SkBitmap;
@@ -85,7 +86,7 @@ class MenuModel {
 
   // Gets the icon for the item at the specified index, returning true if there
   // is an icon, false otherwise.
-  virtual bool GetIconAt(int index, SkBitmap* icon) const = 0;
+  virtual bool GetIconAt(int index, SkBitmap* icon) = 0;
 
   // Returns the model for a menu item with a line of buttons at |index|.
   virtual ButtonMenuItemModel* GetButtonMenuItemAt(int index) const = 0;
@@ -116,6 +117,9 @@ class MenuModel {
   // Called when the menu has been closed.
   virtual void MenuClosed() {}
 
+  // Set the MenuModelDelegate. Owned by the caller of this function.
+  virtual void SetMenuModelDelegate(MenuModelDelegate* delegate) = 0;
+
   // Retrieves the model and index that contains a specific command id. Returns
   // true if an item with the specified command id is found. |model| is inout,
   // and specifies the model to start searching from.