Prefix string16 with base:: in ui/.

ui/base/ime/remote_input_method_win_unittest.cc

Index: ui/base/ime/remote_input_method_win_unittest.cc
diff --git a/ui/base/ime/remote_input_method_win_unittest.cc b/ui/base/ime/remote_input_method_win_unittest.cc
index 084819ed6777069af708cdd46e32bc98cf6b92f3..7c3531ed48d243b3c1b16c03fc095dc822e792ff 100644
--- a/ui/base/ime/remote_input_method_win_unittest.cc
+++ b/ui/base/ime/remote_input_method_win_unittest.cc
@@ -94,7 +94,7 @@ class MockTextInputClient : public DummyTextInputClient {
     inserted_text_.append(1, ch);
     ++call_count_insert_char_;
   }
-  virtual void InsertText(const string16& text) OVERRIDE{
+  virtual void InsertText(const base::string16& text) OVERRIDE{
     inserted_text_.append(text);
     ++call_count_insert_text_;
   }