Replace string16 with base::string16.

chrome/browser/chromeos/input_method/textinput_test_helper.h

Index: chrome/browser/chromeos/input_method/textinput_test_helper.h
diff --git a/chrome/browser/chromeos/input_method/textinput_test_helper.h b/chrome/browser/chromeos/input_method/textinput_test_helper.h
index 92dbc46b33929eb35d2f2ed461b945ae0efd5956..7013a0d4eba56f048f6ed9171542667535761ee2 100644
--- a/chrome/browser/chromeos/input_method/textinput_test_helper.h
+++ b/chrome/browser/chromeos/input_method/textinput_test_helper.h
@@ -35,7 +35,7 @@ class TextInputTestHelper : public ui::InputMethodObserver {
   virtual ~TextInputTestHelper();
 
   // Returns the latest status notified to ui::InputMethod
-  string16 GetSurroundingText() const;
+  base::string16 GetSurroundingText() const;
   gfx::Rect GetCaretRect() const;
   gfx::Rect GetCompositionHead() const;
   gfx::Range GetSelectionRange() const;
@@ -51,7 +51,7 @@ class TextInputTestHelper : public ui::InputMethodObserver {
   void WaitForBlur();
   void WaitForCaretBoundsChanged(const gfx::Rect& expected_caret_rect,
                                  const gfx::Rect& expected_composition_head);
-  void WaitForSurroundingTextChanged(const string16& expected_text,
+  void WaitForSurroundingTextChanged(const base::string16& expected_text,
                                      const gfx::Range& expected_selection);
 
   // Converts from string to gfx::Rect. The string should be "x,y,width,height".
@@ -84,7 +84,7 @@ class TextInputTestHelper : public ui::InputMethodObserver {
   // Represents waiting type of text input event.
   WaitImeEventType waiting_type_;
 
-  string16 surrounding_text_;
+  base::string16 surrounding_text_;
   gfx::Rect caret_rect_;
   gfx::Rect composition_head_;
   gfx::Range selection_range_;