Move Tuple to base namespace.

components/login/base_screen_handler_utils.h

Index: components/login/base_screen_handler_utils.h
diff --git a/components/login/base_screen_handler_utils.h b/components/login/base_screen_handler_utils.h
index 55497a0d74dce195fc2aef46e98862ef115c56a8..3bd1db1c4f8233e3f4fe2543d8982e7557969ca2 100644
--- a/components/login/base_screen_handler_utils.h
+++ b/components/login/base_screen_handler_utils.h
@@ -70,7 +70,7 @@ typename UnwrapConstRef<Arg>::Type ParseArg(const base::ListValue* args) {
 template <typename... Args, size_t... Ns>
 inline void DispatchToCallback(const base::Callback<void(Args...)>& callback,
                                const base::ListValue* args,
-                               IndexSequence<Ns...> indexes) {
+                               base::IndexSequence<Ns...> indexes) {
   DCHECK(args);
   DCHECK_EQ(sizeof...(Args), args->GetSize());
 
@@ -80,7 +80,8 @@ inline void DispatchToCallback(const base::Callback<void(Args...)>& callback,
 template <typename... Args>
 void CallbackWrapper(const base::Callback<void(Args...)>& callback,
                      const base::ListValue* args) {
-  DispatchToCallback(callback, args, MakeIndexSequence<sizeof...(Args)>());
+  DispatchToCallback(callback, args,
+                     base::MakeIndexSequence<sizeof...(Args)>());
 }