Add more string_util functions to base namespace.

ui/views/controls/menu/native_menu_win.cc

Index: ui/views/controls/menu/native_menu_win.cc
diff --git a/ui/views/controls/menu/native_menu_win.cc b/ui/views/controls/menu/native_menu_win.cc
index c29e7b54484acf3cfae08567924971321b7d147d..6ca0b30c44ea0544cbed60f6a564602b98f680e0 100644
--- a/ui/views/controls/menu/native_menu_win.cc
+++ b/ui/views/controls/menu/native_menu_win.cc
@@ -692,7 +692,7 @@ void NativeMenuWin::UpdateMenuItemInfoForString(MENUITEMINFO* mii,
   ui::MenuModel::ItemType type = model_->GetTypeAt(model_index);
   // Strip out any tabs, otherwise they get interpreted as accelerators and can
   // lead to weird behavior.
-  ReplaceSubstringsAfterOffset(&formatted, 0, L"\t", L" ");
+  base::ReplaceSubstringsAfterOffset(&formatted, 0, L"\t", L" ");
   if (type != ui::MenuModel::TYPE_SUBMENU) {
     // Add accelerator details to the label if provided.
     ui::Accelerator accelerator(ui::VKEY_UNKNOWN, ui::EF_NONE);