Prefix string16 with base:: in ui/.

ui/base/win/message_box_win.cc

Index: ui/base/win/message_box_win.cc
diff --git a/ui/base/win/message_box_win.cc b/ui/base/win/message_box_win.cc
index c78e98baf667782ffa0037d066dad2a074471fdb..6500f9861630b2846d3cab284f0cd0c3b506e4f7 100644
--- a/ui/base/win/message_box_win.cc
+++ b/ui/base/win/message_box_win.cc
@@ -14,8 +14,8 @@ namespace ui {
 // RTL locale, we need to make sure that LTR strings are rendered correctly by
 // adding the appropriate Unicode directionality marks.
 int MessageBox(HWND hwnd,
-               const string16& text,
-               const string16& caption,
+               const base::string16& text,
+               const base::string16& caption,
                UINT flags) {
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kNoMessageBox))
     return IDOK;
@@ -24,11 +24,11 @@ int MessageBox(HWND hwnd,
   if (base::i18n::IsRTL())
     actual_flags |= MB_RIGHT | MB_RTLREADING;
 
-  string16 localized_text = text;
+  base::string16 localized_text = text;
   base::i18n::AdjustStringForLocaleDirection(&localized_text);
   const wchar_t* text_ptr = localized_text.c_str();
 
-  string16 localized_caption = caption;
+  base::string16 localized_caption = caption;
   base::i18n::AdjustStringForLocaleDirection(&localized_caption);
   const wchar_t* caption_ptr = localized_caption.c_str();