Added and replaced some UMAs

chrome/browser/language_usage_metrics.h

 // 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.
 
 #ifndef CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_
 #define CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_
 
 #include <set>
 #include <string>
 
+#include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
 
 // Methods to record language usage as UMA histograms.
-// Language codes are defined in third_party/cld/languages/proto/languages.pb.h
 class LanguageUsageMetrics {
  public:
   // Records accept languages as a UMA histogram. |accept_languages| is a
   // case-insensitive comma-separated list of languages/locales of either xx,
   // xx-YY, or xx_YY format where xx is iso-639 language code and YY is iso-3166
   // country code. Country code is ignored. That is, xx and XX-YY are considered
   // identical and recorded once.
   static void RecordAcceptLanguages(const std::string& accept_languages);
 
   // Records the application language as a UMA histogram. |application_locale|
   // is a case-insensitive locale string of either xx, xx-YY, or xx_YY format.
   // Only the language part (xx in the example) is considered.
   static void RecordApplicationLanguage(const std::string& application_locale);
 
- private:
-  // This class must not be instantiated.
-  LanguageUsageMetrics();
-
-  // Parses |accept_languages| and returns a set of language codes in
-  // |languages|.
-  static void ParseAcceptLanguages(const std::string& accept_languages,
-                                   std::set<int>* languages);
-
   // Parses |locale| and returns the language code. Returns 0 in case of errors.
   // The language code is calculated from two alphabets. For example, if
   // |locale| is 'en' which represents 'English', the codes of 'e' and 'n' are
   // 101 and 110 respectively, and the language code will be 101 * 256 + 100 =
   // 25966.
   // |locale| should consist of only lower-case letters. This function doesn't
   // check whether |locale| is valid locale or not strictly.
   static int ToLanguageCode(const std::string &locale);
 
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(LanguageUsageMetrics);
+
+  // Parses |accept_languages| and returns a set of language codes in
+  // |languages|.
+  static void ParseAcceptLanguages(const std::string& accept_languages,
+                                   std::set<int>* languages);
+
   FRIEND_TEST_ALL_PREFIXES(LanguageUsageMetricsTest, ParseAcceptLanguages);
-  FRIEND_TEST_ALL_PREFIXES(LanguageUsageMetricsTest, ToLanguageCode);
 };
 
 #endif  // CHROME_BROWSER_LANGUAGE_USAGE_METRICS_H_