Uses Hash values for sparse histograms for InputMethod.ID statistics.

chrome/browser/chromeos/input_method/input_method_manager_impl.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_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_MANAGER_IMPL_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_MANAGER_IMPL_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 240 matching lines @@
 
 
   // Whether load IME extensions.
   bool enable_extension_loading_;
 
   // The engine map from extension_id to an engine.
   typedef std::map<std::string, InputMethodEngineInterface*> EngineMap;
   typedef std::map<Profile*, EngineMap, ProfileCompare> ProfileEngineMap;
   ProfileEngineMap engine_map_;
 
-  // The map from input method id to the input method stat id.
-  // The stat id has the format: <category#><first char after prefix><index>
-  // For example, Chinese Simplified Pinyin IME has the stat id:
-  //   2,'p',1 -> 211201
-  //   2 means it in INPUT_METHOD_CATEGORY_ZH;
-  //   112 means the first char after prefix is 'p' of 'pinyin';
-  //   01 means it's the second pinyin as the first pinyin is for Traditional
-  //   Chinese Pinyin IME. Note "zh-hant-t-i0-pinyin" < "zh-t-i0-pinyin".
-  std::map<std::string, int> stat_id_map_;
-
   DISALLOW_COPY_AND_ASSIGN(InputMethodManagerImpl);
 };
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_MANAGER_IMPL_H_