Added default implementations of GetAcceleratorForCommandId.

ui/base/models/simple_menu_model.cc

Index: ui/base/models/simple_menu_model.cc
diff --git a/ui/base/models/simple_menu_model.cc b/ui/base/models/simple_menu_model.cc
index 09b08d2a0c265acd421fa04d136589f8986bef9b..a82ac4034a178793aacc763b58f9059917d2109c 100644
--- a/ui/base/models/simple_menu_model.cc
+++ b/ui/base/models/simple_menu_model.cc
@@ -37,6 +37,12 @@ bool SimpleMenuModel::Delegate::IsCommandIdVisible(int command_id) const {
   return true;
 }
 
+bool SimpleMenuModel::Delegate::GetAcceleratorForCommandId(
+    int command_id,
+    ui::Accelerator* accelerator) const {
+  return false;
+}
+
 bool SimpleMenuModel::Delegate::IsItemForCommandIdDynamic(
     int command_id) const {
   return false;