Prefix string16 with base:: in ui/.

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index 05d206028e87d83a12967909f661ef0b64380e8a..179ccc656c976d34dd0ef54154596c2007dcdf74 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -796,7 +796,7 @@ void Widget::UpdateWindowTitle() {
 
   // Update the native frame's text. We do this regardless of whether or not
   // the native frame is being used, since this also updates the taskbar, etc.
-  string16 window_title = widget_delegate_->GetWindowTitle();
+  base::string16 window_title = widget_delegate_->GetWindowTitle();
   base::i18n::AdjustStringForLocaleDirection(&window_title);
   if (!native_widget_->SetWindowTitle(window_title))
     return;