Prefix string16 with base:: in ui/.

ui/views/examples/textfield_example.cc

Index: ui/views/examples/textfield_example.cc
diff --git a/ui/views/examples/textfield_example.cc b/ui/views/examples/textfield_example.cc
index ec18cf74a5bf89088a0bf898d13f5cdbe1b346a7..a33421c9c643ea00223abfed8c3a82f26abdc6fa 100644
--- a/ui/views/examples/textfield_example.cc
+++ b/ui/views/examples/textfield_example.cc
@@ -77,7 +77,7 @@ void TextfieldExample::CreateExampleView(View* container) {
 }
 
 void TextfieldExample::ContentsChanged(Textfield* sender,
-                                       const string16& new_contents) {
+                                       const base::string16& new_contents) {
   if (sender == name_) {
     PrintStatus("Name [%s]", UTF16ToUTF8(new_contents).c_str());
   } else if (sender == password_) {
@@ -102,7 +102,7 @@ void TextfieldExample::ButtonPressed(Button* sender, const ui::Event& event) {
   if (sender == show_password_) {
     PrintStatus("Password [%s]", UTF16ToUTF8(password_->text()).c_str());
   } else if (sender == clear_all_) {
-    string16 empty;
+    base::string16 empty;
     name_->SetText(empty);
     password_->SetText(empty);
     read_only_->SetText(empty);