Update some uses of char16 to use the base:: namespace.

ui/views/controls/textfield/textfield_views_model.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #define UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 
 #include <list>
 #include <vector>
 
@@ skipping 64 matching lines @@
 
   gfx::RenderText* render_text() { return render_text_.get(); }
 
   // Inserts given |text| at the current cursor position.
   // The current composition text will be cleared.
   void InsertText(const base::string16& text) {
     InsertTextInternal(text, false);
   }
 
   // Inserts a character at the current cursor position.
-  void InsertChar(char16 c) {
+  void InsertChar(base::char16 c) {
     InsertTextInternal(base::string16(&c, 1), true);
   }
 
   // Replaces characters at the current position with characters in given text.
   // The current composition text will be cleared.
   void ReplaceText(const base::string16& text) {
     ReplaceTextInternal(text, false);
   }
 
   // Replaces the char at the current position with given character.
-  void ReplaceChar(char16 c) {
+  void ReplaceChar(base::char16 c) {
     ReplaceTextInternal(base::string16(&c, 1), true);
   }
 
   // Appends the text.
   // The current composition text will be confirmed.
   void Append(const base::string16& text);
 
   // Deletes the first character after the current cursor position (as if, the
   // the user has pressed delete key in the textfield). Returns true if
   // the deletion is successful.
@@ skipping 197 matching lines @@
   // 2) new edit is added. (redo history is cleared)
   // 3) redone all undone edits.
   EditHistory::iterator current_edit_;
 
   DISALLOW_COPY_AND_ASSIGN(TextfieldViewsModel);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_