Change GetBrowserItemIndex() to GetLauncherItemIndexForType()

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 5ad43a285926f729dc7fe47a9eddbf69af56ee09..6fdf5e13644b88b9646aaf4798588dbb63d7b184 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -496,16 +496,12 @@ LauncherDelegate* Shell::GetLauncherDelegate() {
     scoped_ptr<LauncherItemDelegate> controller(
         new internal::AppListShelfItemDelegate);
 
-    ash::LauncherID app_list_id = 0;
-    // TODO(simon.hong81): Make function for this in shelf_util.h
     // Finding the launcher model's location of the app list and setting its
     // LauncherItemDelegate.
-    for (size_t i = 0; i < launcher_model_->items().size(); ++i) {
-      if (launcher_model_->items()[i].type == ash::TYPE_APP_LIST) {
-        app_list_id = launcher_model_->items()[i].id;
-        break;
-      }
-    }
+    int app_list_index =
+        ash::GetLauncherItemIndexForType(ash::TYPE_APP_LIST, *launcher_model_);
+    DCHECK_GE(app_list_index, 0);
+    ash::LauncherID app_list_id = launcher_model_->items()[app_list_index].id;
     DCHECK(app_list_id);
     launcher_item_delegate_manager_->SetLauncherItemDelegate(
         app_list_id,