Removes SimpleMenuModel::FlipIndex. It was only used by

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 18acd403095fc8fb2c626c25c7162714a8b18c0f..139bc22dfaf057f100bdb89cbebd36def1d31302 100644
--- a/ui/base/models/simple_menu_model.cc
+++ b/ui/base/models/simple_menu_model.cc
@@ -173,8 +173,7 @@ void SimpleMenuModel::InsertCheckItemAt(
 
 void SimpleMenuModel::InsertCheckItemWithStringIdAt(
     int index, int command_id, int string_id) {
-  InsertCheckItemAt(
-      FlipIndex(index), command_id, l10n_util::GetStringUTF16(string_id));
+  InsertCheckItemAt(index, command_id, l10n_util::GetStringUTF16(string_id));
 }
 
 void SimpleMenuModel::InsertRadioItemAt(
@@ -213,9 +212,8 @@ void SimpleMenuModel::Clear() {
 
 int SimpleMenuModel::GetIndexOfCommandId(int command_id) {
   for (ItemVector::iterator i = items_.begin(); i != items_.end(); ++i) {
-    if (i->command_id == command_id) {
-      return FlipIndex(static_cast<int>(std::distance(items_.begin(), i)));
-    }
+    if (i->command_id == command_id)
+      return static_cast<int>(std::distance(items_.begin(), i));
   }
   return -1;
 }
@@ -237,21 +235,21 @@ int SimpleMenuModel::GetItemCount() const {
 }
 
 MenuModel::ItemType SimpleMenuModel::GetTypeAt(int index) const {
-  return items_[ValidateItemIndex(FlipIndex(index))].type;
+  return items_[ValidateItemIndex(index)].type;
 }
 
 ui::MenuSeparatorType SimpleMenuModel::GetSeparatorTypeAt(int index) const {
-  return items_[ValidateItemIndex(FlipIndex(index))].separator_type;
+  return items_[ValidateItemIndex(index)].separator_type;
 }
 
 int SimpleMenuModel::GetCommandIdAt(int index) const {
-  return items_[ValidateItemIndex(FlipIndex(index))].command_id;
+  return items_[ValidateItemIndex(index)].command_id;
 }
 
 string16 SimpleMenuModel::GetLabelAt(int index) const {
   if (IsItemDynamicAt(index))
     return delegate_->GetLabelForCommandId(GetCommandIdAt(index));
-  return items_[ValidateItemIndex(FlipIndex(index))].label;
+  return items_[ValidateItemIndex(index)].label;
 }
 
 bool SimpleMenuModel::IsItemDynamicAt(int index) const {
@@ -278,7 +276,7 @@ bool SimpleMenuModel::IsItemCheckedAt(int index) const {
 }
 
 int SimpleMenuModel::GetGroupIdAt(int index) const {
-  return items_[ValidateItemIndex(FlipIndex(index))].group_id;
+  return items_[ValidateItemIndex(index)].group_id;
 }
 
 bool SimpleMenuModel::GetIconAt(int index, gfx::Image* icon) {
@@ -294,7 +292,7 @@ bool SimpleMenuModel::GetIconAt(int index, gfx::Image* icon) {
 }
 
 ButtonMenuItemModel* SimpleMenuModel::GetButtonMenuItemAt(int index) const {
-  return items_[ValidateItemIndex(FlipIndex(index))].button_model;
+  return items_[ValidateItemIndex(index)].button_model;
 }
 
 bool SimpleMenuModel::IsEnabledAt(int index) const {
@@ -327,7 +325,7 @@ void SimpleMenuModel::ActivatedAt(int index, int event_flags) {
 }
 
 MenuModel* SimpleMenuModel::GetSubmenuModelAt(int index) const {
-  return items_[ValidateItemIndex(FlipIndex(index))].submenu;
+  return items_[ValidateItemIndex(index)].submenu;
 }
 
 void SimpleMenuModel::MenuWillShow() {
@@ -358,10 +356,6 @@ void SimpleMenuModel::OnMenuClosed() {
     delegate_->MenuClosed(this);
 }
 
-int SimpleMenuModel::FlipIndex(int index) const {
-  return index;
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 // SimpleMenuModel, Private:
 
@@ -378,7 +372,7 @@ void SimpleMenuModel::AppendItem(const Item& item) {
 
 void SimpleMenuModel::InsertItemAtIndex(const Item& item, int index) {
   ValidateItem(item);
-  items_.insert(items_.begin() + FlipIndex(index), item);
+  items_.insert(items_.begin() + index, item);
 }
 
 void SimpleMenuModel::ValidateItem(const Item& item) {