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

chrome/renderer/spellchecker/spellcheck_worditerator.h

Index: chrome/renderer/spellchecker/spellcheck_worditerator.h
diff --git a/chrome/renderer/spellchecker/spellcheck_worditerator.h b/chrome/renderer/spellchecker/spellcheck_worditerator.h
index 3a757b99656ea6814360dd5536122de0960f1261..09d54a69159f6ded7354c8c154dbd13a6e6a053f 100644
--- a/chrome/renderer/spellchecker/spellcheck_worditerator.h
+++ b/chrome/renderer/spellchecker/spellcheck_worditerator.h
@@ -122,7 +122,7 @@ class SpellcheckWordIterator {
   // Set text to be iterated. (This text does not have to be NULL-terminated.)
   // This function also resets internal state so we can reuse this iterator
   // without calling Initialize().
-  bool SetText(const char16* text, size_t length);
+  bool SetText(const base::char16* text, size_t length);
 
   // Retrieves a word (or a contraction), stores its copy to 'word_string', and
   // stores the position and the length for input word to 'word_start'. Since
@@ -154,7 +154,7 @@ class SpellcheckWordIterator {
                  base::string16* output_string) const;
 
   // The pointer to the input string from which we are extracting words.
-  const char16* text_;
+  const base::char16* text_;
 
   // The length of the original string.
   int length_;