Add 2-lines summary to CC/Address for Wallet items.

ui/base/models/menu_model.cc

Index: ui/base/models/menu_model.cc
diff --git a/ui/base/models/menu_model.cc b/ui/base/models/menu_model.cc
index 1a3190d6db0a396dec64847ba4b4e16b762007a4..60d47fdc5c94eaf34e04ea951d06c7e231be7f42 100644
--- a/ui/base/models/menu_model.cc
+++ b/ui/base/models/menu_model.cc
@@ -32,10 +32,18 @@ bool MenuModel::GetModelAndIndexForCommandId(int command_id,
   return false;
 }
 
+string16 MenuModel::GetSublabelAt(int index) const {
+  return string16();
+}
+
 const gfx::Font* MenuModel::GetLabelFontAt(int index) const {
   return NULL;
 }
 
+const gfx::Font* MenuModel::GetSublabelFontAt(int index) const {
+  return NULL;
+}
+
 // Default implementation ignores the event flags.
 void MenuModel::ActivatedAt(int index, int event_flags) {
   ActivatedAt(index);