Clean up sparse_histogram.h header

components/language_usage_metrics/language_usage_metrics.cc

 // Copyright 2014 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 "components/language_usage_metrics/language_usage_metrics.h"
 
 #include <algorithm>
 
-#include "base/metrics/sparse_histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 
 namespace {
 void RecordAcceptLanguage(int language_code) {
   UMA_HISTOGRAM_SPARSE_SLOWLY("LanguageUsage.AcceptLanguage",
                               language_code);
 }
 }  // namespace
 
@@ skipping 45 matching lines @@
   languages->clear();
   base::StringTokenizer locales(accept_languages, ",");
   while (locales.GetNext()) {
     const int language_code = ToLanguageCode(locales.token());
     if (language_code != 0)
       languages->insert(language_code);
   }
 }
 
 }  // namespace language_usage_metrics