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

chrome/browser/spellchecker/spellcheck_host_metrics.cc

 // Copyright (c) 2011 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.
 
 #include "chrome/browser/spellchecker/spellcheck_host_metrics.h"
 
 #include "base/md5.h"
 #include "base/metrics/histogram.h"
 
 SpellCheckHostMetrics::SpellCheckHostMetrics()
@@ skipping 42 matching lines @@
     if (misspelled_word_count_ == 1)
       RecordReplacedWordStats(0);
   }
 
   int percentage = (100 * misspelled_word_count_) / spellchecked_word_count_;
   UMA_HISTOGRAM_PERCENTAGE("SpellCheck.MisspellRatio", percentage);
 
   // Collects actual number of checked words, excluding duplication.
   base::MD5Digest digest;
   base::MD5Sum(reinterpret_cast<const unsigned char*>(word.c_str()),
-         word.size() * sizeof(char16), &digest);
+         word.size() * sizeof(base::char16), &digest);
   checked_word_hashes_.insert(base::MD5DigestToBase16(digest));
 
   RecordWordCounts();
 }
 
 void SpellCheckHostMetrics::OnHistogramTimerExpired() {
   if (0 < spellchecked_word_count_) {
     // Collects word checking rate, which is represented
     // as a word count per hour.
     base::TimeDelta since_start = base::TimeTicks::Now() - start_time_;
@@ skipping 64 matching lines @@
   if (suggestion_show_count_ != last_suggestion_show_count_) {
     DCHECK(suggestion_show_count_ > last_suggestion_show_count_);
     UMA_HISTOGRAM_COUNTS("SpellCheck.ShownSuggestions", suggestion_show_count_);
     last_suggestion_show_count_ = suggestion_show_count_;
   }
 }
 
 void SpellCheckHostMetrics::RecordSpellingServiceStats(bool enabled) {
   UMA_HISTOGRAM_BOOLEAN("SpellCheck.SpellingService.Enabled", enabled);
 }