Remove rerely used configuration items for the Japanese IME to simplify the dialog.

chrome/common/pref_names.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.
 
 // Constants for the names of various preferences, for easier changing.
 
 #ifndef CHROME_COMMON_PREF_NAMES_H_
 #define CHROME_COMMON_PREF_NAMES_H_
 #pragma once
 
@@ skipping 170 matching lines @@
 extern const char kLanguageMozcSessionKeymap[];
 extern const char kLanguageMozcPunctuationMethod[];
 extern const char kLanguageMozcSymbolMethod[];
 extern const char kLanguageMozcSpaceCharacterForm[];
 extern const char kLanguageMozcHistoryLearningLevel[];
 extern const char kLanguageMozcSelectionShortcut[];
 extern const char kLanguageMozcShiftKeyModeSwitch[];
 extern const char kLanguageMozcNumpadCharacterForm[];
 extern const char kLanguageMozcIncognitoMode[];
 extern const char kLanguageMozcUseAutoImeTurnOff[];
-extern const char kLanguageMozcUseDateConversion[];
-extern const char kLanguageMozcUseSingleKanjiConversion[];
-extern const char kLanguageMozcUseSymbolConversion[];
-extern const char kLanguageMozcUseNumberConversion[];
 extern const char kLanguageMozcUseHistorySuggest[];
 extern const char kLanguageMozcUseDictionarySuggest[];
 extern const char kLanguageMozcSuggestionsSize[];
 extern const char kLanguageXkbRemapSearchKeyTo[];
 extern const char kLanguageXkbRemapControlKeyTo[];
 extern const char kLanguageXkbRemapAltKeyTo[];
 extern const char kLanguageXkbAutoRepeatEnabled[];
 extern const char kLanguageXkbAutoRepeatDelay[];
 extern const char kLanguageXkbAutoRepeatInterval[];
 extern const char kLanguagePreferredVirtualKeyboard[];
@@ skipping 380 matching lines @@
 
 extern const char kUserCreatedLoginItem[];
 extern const char kBackgroundModeEnabled[];
 
 extern const char kDevicePolicyRefreshRate[];
 extern const char kUserPolicyRefreshRate[];
 
 }  // namespace prefs
 
 #endif  // CHROME_COMMON_PREF_NAMES_H_