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

chrome/renderer/spellchecker/spellcheck.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 CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_
 #define CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 48 matching lines @@
   // SpellCheck a word.
   // Returns true if spelled correctly, false otherwise.
   // If the spellchecker failed to initialize, always returns true.
   // The |tag| parameter should either be a unique identifier for the document
   // that the word came from (if the current platform requires it), or 0.
   // In addition, finds the suggested words for a given word
   // and puts them into |*optional_suggestions|.
   // If the word is spelled correctly, the vector is empty.
   // If optional_suggestions is NULL, suggested words will not be looked up.
   // Note that Doing suggest lookups can be slow.
-  bool SpellCheckWord(const char16* in_word,
+  bool SpellCheckWord(const base::char16* in_word,
                       int in_word_len,
                       int tag,
                       int* misspelling_start,
                       int* misspelling_len,
                       std::vector<base::string16>* optional_suggestions);
 
   // SpellCheck a paragraph.
   // Returns true if |text| is correctly spelled, false otherwise.
   // If the spellchecker failed to initialize, always returns true.
   bool SpellCheckParagraph(
@@ skipping 73 matching lines @@
   // Remember state for auto spell correct.
   bool auto_spell_correct_turned_on_;
 
   // Remember state for spellchecking.
   bool spellcheck_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellCheck);
 };
 
 #endif  // CHROME_RENDERER_SPELLCHECKER_SPELLCHECK_H_