Remove text encoding UI

chrome/browser/character_encoding.cc

 // 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.
 
 #include "chrome/browser/character_encoding.h"
 
-#include <stddef.h>
-
-#include <map>
-#include <memory>
-#include <set>
-
-#include "base/logging.h"
 #include "base/macros.h"
-#include "base/strings/string_tokenizer.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-#include "chrome/app/chrome_command_ids.h"
-#include "chrome/grit/generated_resources.h"
-#include "content/public/browser/browser_thread.h"
 #include "third_party/icu/source/common/unicode/ucnv.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/l10n/l10n_util_collator.h"
-
-using content::BrowserThread;
 
 namespace {
 
-// The maximum length of short list of recently user selected encodings is 3.
-const size_t kUserSelectedEncodingsMaxLength = 3;
+// An array of all supported canonical encoding names.
+const char* const kCanonicalEncodingNames[] = {
+    "Big5",
+    "EUC-JP",
+    "EUC-KR",
+    "gb18030",
+    "GBK",
+    "IBM866",
+    "ISO-2022-JP",
+    "ISO-8859-10",
+    "ISO-8859-13",
+    "ISO-8859-14",
+    "ISO-8859-15",
+    "ISO-8859-16",
+    "ISO-8859-2",
+    "ISO-8859-3",
+    "ISO-8859-4",
+    "ISO-8859-5",
+    "ISO-8859-6",
+    "ISO-8859-7",
+    "ISO-8859-8",
+    "ISO-8859-8-I",
+    "KOI8-R",
+    "KOI8-U",
+    "macintosh",
+    "Shift_JIS",
+    "UTF-16LE",
+    "UTF-8",
+    "windows-1250",
+    "windows-1251",
+    "windows-1252",
+    "windows-1253",
+    "windows-1254",
+    "windows-1255",
+    "windows-1256",
+    "windows-1257",
+    "windows-1258",
+    "windows-874"
+};
+} // namespace
 
-typedef struct {
-  int resource_id;
-  const char* name;
-  int category_string_id;
-} CanonicalEncodingData;
-
-// An array of all supported canonical encoding names.
-const CanonicalEncodingData kCanonicalEncodingNames[] = {
-  { IDC_ENCODING_UTF8, "UTF-8", IDS_ENCODING_UNICODE },
-  { IDC_ENCODING_UTF16LE, "UTF-16LE", IDS_ENCODING_UNICODE },
-  { IDC_ENCODING_WINDOWS1252, "windows-1252", IDS_ENCODING_WESTERN },
-  { IDC_ENCODING_GBK, "GBK", IDS_ENCODING_SIMP_CHINESE },
-  { IDC_ENCODING_GB18030, "gb18030", IDS_ENCODING_SIMP_CHINESE },
-  { IDC_ENCODING_BIG5, "Big5", IDS_ENCODING_TRAD_CHINESE },
-  { IDC_ENCODING_KOREAN, "EUC-KR", IDS_ENCODING_KOREAN },
-  { IDC_ENCODING_SHIFTJIS, "Shift_JIS", IDS_ENCODING_JAPANESE },
-  { IDC_ENCODING_EUCJP, "EUC-JP", IDS_ENCODING_JAPANESE },
-  { IDC_ENCODING_ISO2022JP, "ISO-2022-JP", IDS_ENCODING_JAPANESE },
-  { IDC_ENCODING_THAI, "windows-874", IDS_ENCODING_THAI },
-  { IDC_ENCODING_ISO885915, "ISO-8859-15", IDS_ENCODING_WESTERN },
-  { IDC_ENCODING_MACINTOSH, "macintosh", IDS_ENCODING_WESTERN },
-  { IDC_ENCODING_ISO88592, "ISO-8859-2", IDS_ENCODING_CENTRAL_EUROPEAN },
-  { IDC_ENCODING_WINDOWS1250, "windows-1250", IDS_ENCODING_CENTRAL_EUROPEAN },
-  { IDC_ENCODING_ISO88595, "ISO-8859-5", IDS_ENCODING_CYRILLIC },
-  { IDC_ENCODING_WINDOWS1251, "windows-1251", IDS_ENCODING_CYRILLIC },
-  { IDC_ENCODING_KOI8R, "KOI8-R", IDS_ENCODING_CYRILLIC },
-  { IDC_ENCODING_KOI8U, "KOI8-U", IDS_ENCODING_CYRILLIC },
-  { IDC_ENCODING_IBM866, "IBM866", IDS_ENCODING_CYRILLIC },
-  { IDC_ENCODING_ISO88597, "ISO-8859-7", IDS_ENCODING_GREEK },
-  { IDC_ENCODING_WINDOWS1253, "windows-1253", IDS_ENCODING_GREEK },
-  { IDC_ENCODING_WINDOWS1254, "windows-1254", IDS_ENCODING_TURKISH },
-  { IDC_ENCODING_WINDOWS1256, "windows-1256", IDS_ENCODING_ARABIC },
-  { IDC_ENCODING_ISO88596, "ISO-8859-6", IDS_ENCODING_ARABIC },
-  { IDC_ENCODING_WINDOWS1255, "windows-1255", IDS_ENCODING_HEBREW },
-  { IDC_ENCODING_ISO88598I, "ISO-8859-8-I", IDS_ENCODING_HEBREW },
-  { IDC_ENCODING_ISO88598, "ISO-8859-8", IDS_ENCODING_HEBREW },
-  { IDC_ENCODING_WINDOWS1258, "windows-1258", IDS_ENCODING_VIETNAMESE },
-  { IDC_ENCODING_ISO88594, "ISO-8859-4", IDS_ENCODING_BALTIC },
-  { IDC_ENCODING_ISO885913, "ISO-8859-13", IDS_ENCODING_BALTIC },
-  { IDC_ENCODING_WINDOWS1257, "windows-1257", IDS_ENCODING_BALTIC },
-  { IDC_ENCODING_ISO88593, "ISO-8859-3", IDS_ENCODING_SOUTH_EUROPEAN },
-  { IDC_ENCODING_ISO885910, "ISO-8859-10", IDS_ENCODING_NORDIC },
-  { IDC_ENCODING_ISO885914, "ISO-8859-14", IDS_ENCODING_CELTIC },
-  { IDC_ENCODING_ISO885916, "ISO-8859-16", IDS_ENCODING_ROMANIAN },
-};
-
-const int kCanonicalEncodingNamesLength = arraysize(kCanonicalEncodingNames);
-
-typedef std::map<int, std::pair<const char*, int> >
-    IdToCanonicalEncodingNameMapType;
-typedef std::map<const std::string, int> CanonicalEncodingNameToIdMapType;
-
-typedef struct {
-  const char* canonical_form;
-  const char* display_form;
-} CanonicalEncodingDisplayNamePair;
-
-const CanonicalEncodingDisplayNamePair kCanonicalDisplayNameOverrides[] = {
-  // Only lists the canonical names where we want a different form for display.
-  { "macintosh", "Macintosh" },
-  { "windows-874", "Windows-874" },
-  { "windows-1250", "Windows-1250" },
-  { "windows-1251", "Windows-1251" },
-  { "windows-1252", "Windows-1252" },
-  { "windows-1253", "Windows-1253" },
-  { "windows-1254", "Windows-1254" },
-  { "windows-1255", "Windows-1255" },
-  { "windows-1256", "Windows-1256" },
-  { "windows-1257", "Windows-1257" },
-  { "windows-1258", "Windows-1258" },
-};
-
-const int kCanonicalDisplayNameOverridesLength =
-    arraysize(kCanonicalDisplayNameOverrides);
-
-typedef std::map<std::string, const char*> CanonicalNameDisplayNameMapType;
-
-class CanonicalEncodingMap {
- public:
-  CanonicalEncodingMap() {}
-  const IdToCanonicalEncodingNameMapType* GetIdToCanonicalEncodingNameMapData();
-  const CanonicalEncodingNameToIdMapType* GetCanonicalEncodingNameToIdMapData();
-  const CanonicalNameDisplayNameMapType* GetCanonicalNameDisplayNameMapData();
-  std::vector<int>* locale_dependent_encoding_ids() {
-    return &locale_dependent_encoding_ids_;
+std::string GetCanonicalEncodingNameByAliasName(const std::string& alias_name) {
+  for (size_t i = 0; i < arraysize(kCanonicalEncodingNames); ++i) {
+    if (alias_name == kCanonicalEncodingNames[i])
+      return alias_name;
   }
-
-  std::vector<CharacterEncoding::EncodingInfo>* current_display_encodings() {
-    return &current_display_encodings_;
-  }
-
- private:
-  std::unique_ptr<IdToCanonicalEncodingNameMapType> id_to_encoding_name_map_;
-  std::unique_ptr<CanonicalEncodingNameToIdMapType> encoding_name_to_id_map_;
-  std::unique_ptr<CanonicalNameDisplayNameMapType>
-      encoding_name_to_display_name_map_;
-  std::vector<int> locale_dependent_encoding_ids_;
-  std::vector<CharacterEncoding::EncodingInfo> current_display_encodings_;
-
-  DISALLOW_COPY_AND_ASSIGN(CanonicalEncodingMap);
-};
-
-const IdToCanonicalEncodingNameMapType*
-    CanonicalEncodingMap::GetIdToCanonicalEncodingNameMapData() {
-  // Testing and building map is not thread safe, this function is supposed to
-  // only run in UI thread. Myabe I should add a lock in here for making it as
-  // thread safe.
-  if (!id_to_encoding_name_map_.get()) {
-    id_to_encoding_name_map_.reset(new IdToCanonicalEncodingNameMapType);
-    for (int i = 0; i < kCanonicalEncodingNamesLength; ++i) {
-      int resource_id = kCanonicalEncodingNames[i].resource_id;
-      (*id_to_encoding_name_map_)[resource_id] =
-        std::make_pair(kCanonicalEncodingNames[i].name,
-                       kCanonicalEncodingNames[i].category_string_id);
-    }
-  }
-  return id_to_encoding_name_map_.get();
-}
-
-const CanonicalEncodingNameToIdMapType*
-    CanonicalEncodingMap::GetCanonicalEncodingNameToIdMapData() {
-  if (!encoding_name_to_id_map_.get()) {
-    encoding_name_to_id_map_.reset(new CanonicalEncodingNameToIdMapType);
-    for (int i = 0; i < kCanonicalEncodingNamesLength; ++i) {
-      (*encoding_name_to_id_map_)[kCanonicalEncodingNames[i].name] =
-          kCanonicalEncodingNames[i].resource_id;
-    }
-  }
-  return encoding_name_to_id_map_.get();
-}
-
-const CanonicalNameDisplayNameMapType*
-    CanonicalEncodingMap::GetCanonicalNameDisplayNameMapData() {
-  if (!encoding_name_to_display_name_map_.get()) {
-    encoding_name_to_display_name_map_.reset(
-        new CanonicalNameDisplayNameMapType);
-    // First store the names in the kCanonicalEncodingNames list.
-    for (int i = 0; i < kCanonicalEncodingNamesLength; ++i) {
-      (*encoding_name_to_display_name_map_)[kCanonicalEncodingNames[i].name] =
-          kCanonicalEncodingNames[i].name;
-    }
-    // Then save in the overrides.
-    for (int i = 0; i < kCanonicalDisplayNameOverridesLength; ++i) {
-      (*encoding_name_to_display_name_map_)
-          [kCanonicalDisplayNameOverrides[i].canonical_form] =
-          kCanonicalDisplayNameOverrides[i].display_form;
-    }
-    DCHECK(static_cast<int>(encoding_name_to_display_name_map_->size()) ==
-           kCanonicalEncodingNamesLength)
-        << "Got an override that wasn't in the encoding list";
-  }
-  return encoding_name_to_display_name_map_.get();
-}
-
-// A static map object which contains all resourceid-nonsequenced canonical
-// encoding names.
-CanonicalEncodingMap* CanonicalEncodingMapSingleton() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  static CanonicalEncodingMap* singleton = new CanonicalEncodingMap;
-  return singleton;
-}
-
-const int kDefaultEncodingMenus[] = {
-  IDC_ENCODING_UTF16LE,
-  IDC_ENCODING_WINDOWS1252,
-  IDC_ENCODING_GBK,
-  IDC_ENCODING_GB18030,
-  IDC_ENCODING_BIG5,
-  IDC_ENCODING_KOREAN,
-  IDC_ENCODING_SHIFTJIS,
-  IDC_ENCODING_EUCJP,
-  IDC_ENCODING_ISO2022JP,
-  IDC_ENCODING_THAI,
-  IDC_ENCODING_ISO885915,
-  IDC_ENCODING_MACINTOSH,
-  IDC_ENCODING_ISO88592,
-  IDC_ENCODING_WINDOWS1250,
-  IDC_ENCODING_ISO88595,
-  IDC_ENCODING_WINDOWS1251,
-  IDC_ENCODING_KOI8R,
-  IDC_ENCODING_KOI8U,
-  IDC_ENCODING_IBM866,
-  IDC_ENCODING_ISO88597,
-  IDC_ENCODING_WINDOWS1253,
-  IDC_ENCODING_WINDOWS1254,
-  IDC_ENCODING_WINDOWS1256,
-  IDC_ENCODING_ISO88596,
-  IDC_ENCODING_WINDOWS1255,
-  IDC_ENCODING_ISO88598I,
-  IDC_ENCODING_ISO88598,
-  IDC_ENCODING_WINDOWS1258,
-  IDC_ENCODING_ISO88594,
-  IDC_ENCODING_ISO885913,
-  IDC_ENCODING_WINDOWS1257,
-  IDC_ENCODING_ISO88593,
-  IDC_ENCODING_ISO885910,
-  IDC_ENCODING_ISO885914,
-  IDC_ENCODING_ISO885916,
-};
-
-const int kDefaultEncodingMenusLength = arraysize(kDefaultEncodingMenus);
-
-// Parse the input |encoding_list| which is a encoding list separated with
-// comma, get available encoding ids and save them to |available_list|.
-// The parameter |maximum_size| indicates maximum size of encoding items we
-// want to get from the |encoding_list|.
-void ParseEncodingListSeparatedWithComma(
-    const std::string& encoding_list, std::vector<int>* const available_list,
-    size_t maximum_size) {
-  base::StringTokenizer tokenizer(encoding_list, ",");
-  while (tokenizer.GetNext()) {
-    int id = CharacterEncoding::GetCommandIdByCanonicalEncodingName(
-        tokenizer.token());
-    // Ignore invalid encoding.
-    if (!id)
-      continue;
-    available_list->push_back(id);
-    if (available_list->size() == maximum_size)
-      return;
-  }
-}
-
-base::string16 GetEncodingDisplayName(const std::string& encoding_name,
-                                      int category_string_id) {
-  base::string16 category_name = l10n_util::GetStringUTF16(category_string_id);
-  if (category_string_id != IDS_ENCODING_KOREAN &&
-      category_string_id != IDS_ENCODING_THAI &&
-      category_string_id != IDS_ENCODING_TURKISH &&
-      category_string_id != IDS_ENCODING_VIETNAMESE &&
-      category_string_id != IDS_ENCODING_ROMANIAN) {
-    const CanonicalNameDisplayNameMapType* map =
-        CanonicalEncodingMapSingleton()->GetCanonicalNameDisplayNameMapData();
-    DCHECK(map);
-
-    CanonicalNameDisplayNameMapType::const_iterator found_name =
-        map->find(encoding_name);
-    DCHECK(found_name != map->end());
-    return l10n_util::GetStringFUTF16(IDS_ENCODING_DISPLAY_TEMPLATE,
-                                      category_name,
-                                      base::ASCIIToUTF16(found_name->second));
-  }
-  return category_name;
-}
-
-int GetEncodingCategoryStringIdByCommandId(int id) {
-  const IdToCanonicalEncodingNameMapType* map =
-      CanonicalEncodingMapSingleton()->GetIdToCanonicalEncodingNameMapData();
-  DCHECK(map);
-
-  IdToCanonicalEncodingNameMapType::const_iterator found_name = map->find(id);
-  if (found_name != map->end())
-    return found_name->second.second;
-  return 0;
-}
-
-std::string GetEncodingCategoryStringByCommandId(int id) {
-  int category_id = GetEncodingCategoryStringIdByCommandId(id);
-  if (category_id)
-    return l10n_util::GetStringUTF8(category_id);
-  return std::string();
-}
-
-}  // namespace
-
-CharacterEncoding::EncodingInfo::EncodingInfo(int id)
-    : encoding_id(id) {
-  encoding_category_name =
-      base::UTF8ToUTF16(GetEncodingCategoryStringByCommandId(id));
-  encoding_display_name = GetCanonicalEncodingDisplayNameByCommandId(id);
-}
-
-// Static.
-int CharacterEncoding::GetCommandIdByCanonicalEncodingName(
-    const std::string& encoding_name) {
-  const CanonicalEncodingNameToIdMapType* map =
-      CanonicalEncodingMapSingleton()->GetCanonicalEncodingNameToIdMapData();
-  DCHECK(map);
-
-  CanonicalEncodingNameToIdMapType::const_iterator found_id =
-      map->find(encoding_name);
-  if (found_id != map->end())
-    return found_id->second;
-  return 0;
-}
-
-// Static.
-std::string CharacterEncoding::GetCanonicalEncodingNameByCommandId(int id) {
-  const IdToCanonicalEncodingNameMapType* map =
-      CanonicalEncodingMapSingleton()->GetIdToCanonicalEncodingNameMapData();
-  DCHECK(map);
-
-  IdToCanonicalEncodingNameMapType::const_iterator found_name = map->find(id);
-  if (found_name != map->end())
-    return found_name->second.first;
-  return std::string();
-}
-
-// Static.
-base::string16 CharacterEncoding::GetCanonicalEncodingDisplayNameByCommandId(
-    int id) {
-  const IdToCanonicalEncodingNameMapType* map =
-      CanonicalEncodingMapSingleton()->GetIdToCanonicalEncodingNameMapData();
-  DCHECK(map);
-
-  IdToCanonicalEncodingNameMapType::const_iterator found_name = map->find(id);
-  if (found_name != map->end())
-    return GetEncodingDisplayName(found_name->second.first,
-                                  found_name->second.second);
-  return base::string16();
-}
-
-// Static.
-// Return count number of all supported canonical encoding.
-int CharacterEncoding::GetSupportCanonicalEncodingCount() {
-  return kCanonicalEncodingNamesLength;
-}
-
-// Static.
-std::string CharacterEncoding::GetCanonicalEncodingNameByIndex(int index) {
-  if (index < kCanonicalEncodingNamesLength)
-    return kCanonicalEncodingNames[index].name;
-  return std::string();
-}
-
-// Static.
-base::string16 CharacterEncoding::GetCanonicalEncodingDisplayNameByIndex(
-    int index) {
-  if (index < kCanonicalEncodingNamesLength)
-    return GetEncodingDisplayName(kCanonicalEncodingNames[index].name,
-        kCanonicalEncodingNames[index].category_string_id);
-  return base::string16();
-}
-
-// Static.
-int CharacterEncoding::GetEncodingCommandIdByIndex(int index) {
-  if (index < kCanonicalEncodingNamesLength)
-    return kCanonicalEncodingNames[index].resource_id;
-  return 0;
-}
-
-// Static.
-std::string CharacterEncoding::GetCanonicalEncodingNameByAliasName(
-    const std::string& alias_name) {
-  // If the input alias_name is already canonical encoding name, just return it.
-  const CanonicalEncodingNameToIdMapType* map =
-      CanonicalEncodingMapSingleton()->GetCanonicalEncodingNameToIdMapData();
-  DCHECK(map);
-
-  CanonicalEncodingNameToIdMapType::const_iterator found_id =
-      map->find(alias_name);
-  if (found_id != map->end())
-    return alias_name;
-
   const char* standards[3] = { "HTML", "MIME", "IANA" };
   for (size_t i = 0; i < arraysize(standards); ++i) {
     UErrorCode error_code = U_ZERO_ERROR;
     const char* canonical_name = ucnv_getCanonicalName(
         alias_name.c_str(), standards[i], &error_code);
     if (U_SUCCESS(error_code) && canonical_name)
       return canonical_name;
   }
   return std::string();
 }
-
-// Static
-// According to the behavior of user recently selected encoding short list in
-// Firefox, we always put UTF-8 as top position, after then put user
-// recent selected encodings, then put local dependent encoding items.
-// At last, we put all remaining encoding items.
-const std::vector<CharacterEncoding::EncodingInfo>*
-    CharacterEncoding::GetCurrentDisplayEncodings(
-    const std::string& locale,
-    const std::string& locale_encodings,
-    const std::string& recently_select_encodings) {
-  std::vector<int>* const locale_dependent_encoding_list =
-      CanonicalEncodingMapSingleton()->locale_dependent_encoding_ids();
-  std::vector<CharacterEncoding::EncodingInfo>* const encoding_list =
-      CanonicalEncodingMapSingleton()->current_display_encodings();
-
-  // Initialize locale dependent static encoding list.
-  if (locale_dependent_encoding_list->empty() && !locale_encodings.empty())
-    ParseEncodingListSeparatedWithComma(locale_encodings,
-                                        locale_dependent_encoding_list,
-                                        kUserSelectedEncodingsMaxLength);
-
-  CR_DEFINE_STATIC_LOCAL(std::string, cached_user_selected_encodings, ());
-  // Build current display encoding list.
-  if (encoding_list->empty() ||
-      cached_user_selected_encodings != recently_select_encodings) {
-    // Update user recently selected encodings.
-    cached_user_selected_encodings = recently_select_encodings;
-    // Clear old encoding list since user recently selected encodings changed.
-    encoding_list->clear();
-    // Always add UTF-8 to first encoding position.
-    encoding_list->push_back(EncodingInfo(IDC_ENCODING_UTF8));
-    std::set<int> inserted_encoding;
-    inserted_encoding.insert(IDC_ENCODING_UTF8);
-
-    // Parse user recently selected encodings and get list
-    std::vector<int> recently_select_encoding_list;
-    ParseEncodingListSeparatedWithComma(recently_select_encodings,
-                                        &recently_select_encoding_list,
-                                        kUserSelectedEncodingsMaxLength);
-
-    // Put 'cached encodings' (dynamic encoding list) after 'local dependent
-    // encoding list'.
-    recently_select_encoding_list.insert(recently_select_encoding_list.begin(),
-        locale_dependent_encoding_list->begin(),
-        locale_dependent_encoding_list->end());
-    for (std::vector<int>::iterator it = recently_select_encoding_list.begin();
-         it != recently_select_encoding_list.end(); ++it) {
-        // Test whether we have met this encoding id.
-        bool ok = inserted_encoding.insert(*it).second;
-        // Duplicated encoding, ignore it. Ideally, this situation should not
-        // happened, but just in case some one manually edit preference file.
-        if (!ok)
-          continue;
-        encoding_list->push_back(EncodingInfo(*it));
-    }
-    // Append a separator;
-    encoding_list->push_back(EncodingInfo(0));
-
-    // We need to keep "Unicode (UTF-16LE)" always at the top (among the rest
-    // of encodings) instead of being sorted along with other encodings. So if
-    // "Unicode (UTF-16LE)" is already in previous encodings, sort the rest
-    // of encodings. Otherwise Put "Unicode (UTF-16LE)" on the first of the
-    // rest of encodings, skip "Unicode (UTF-16LE)" and sort all left encodings.
-    int start_sorted_index = encoding_list->size();
-    if (inserted_encoding.find(IDC_ENCODING_UTF16LE) ==
-        inserted_encoding.end()) {
-      encoding_list->push_back(EncodingInfo(IDC_ENCODING_UTF16LE));
-      inserted_encoding.insert(IDC_ENCODING_UTF16LE);
-      start_sorted_index++;
-    }
-
-    // Add the rest of encodings that are neither in the static encoding list
-    // nor in the list of recently selected encodings.
-    // Build the encoding list sorted in the current locale sorting order.
-    for (int i = 0; i < kDefaultEncodingMenusLength; ++i) {
-      int id = kDefaultEncodingMenus[i];
-      // We have inserted this encoding, skip it.
-      if (inserted_encoding.find(id) != inserted_encoding.end())
-        continue;
-      encoding_list->push_back(EncodingInfo(id));
-    }
-    // Sort the encoding list.
-    l10n_util::SortVectorWithStringKey(locale,
-                                       encoding_list,
-                                       start_sorted_index,
-                                       encoding_list->size(),
-                                       true);
-  }
-  DCHECK(!encoding_list->empty());
-  return encoding_list;
-}
-
-// Static
-bool CharacterEncoding::UpdateRecentlySelectedEncoding(
-    const std::string& original_selected_encodings,
-    int new_selected_encoding_id,
-    std::string* selected_encodings) {
-  // Get encoding name.
-  std::string encoding_name =
-      GetCanonicalEncodingNameByCommandId(new_selected_encoding_id);
-  DCHECK(!encoding_name.empty());
-  // Check whether the new encoding is in local dependent encodings or original
-  // recently selected encodings. If yes, do not add it.
-  std::vector<int>* locale_dependent_encoding_list =
-      CanonicalEncodingMapSingleton()->locale_dependent_encoding_ids();
-  DCHECK(locale_dependent_encoding_list);
-  std::vector<int> selected_encoding_list;
-  ParseEncodingListSeparatedWithComma(original_selected_encodings,
-                                      &selected_encoding_list,
-                                      kUserSelectedEncodingsMaxLength);
-  // Put 'cached encodings' (dynamic encoding list) after 'local dependent
-  // encoding list' for check.
-  std::vector<int> top_encoding_list(*locale_dependent_encoding_list);
-  // UTF8 is always in our optimized encoding list.
-  top_encoding_list.insert(top_encoding_list.begin(), IDC_ENCODING_UTF8);
-  top_encoding_list.insert(top_encoding_list.end(),
-                           selected_encoding_list.begin(),
-                           selected_encoding_list.end());
-  for (std::vector<int>::const_iterator it = top_encoding_list.begin();
-       it != top_encoding_list.end(); ++it)
-    if (*it == new_selected_encoding_id)
-      return false;
-  // Need to add the encoding id to recently selected encoding list.
-  // Remove the last encoding in original list.
-  if (selected_encoding_list.size() == kUserSelectedEncodingsMaxLength)
-    selected_encoding_list.pop_back();
-  // Insert new encoding to head of selected encoding list.
-  *selected_encodings = encoding_name;
-  // Generate the string for rest selected encoding list.
-  for (std::vector<int>::const_iterator it = selected_encoding_list.begin();
-       it != selected_encoding_list.end(); ++it) {
-    selected_encodings->append(1, L',');
-    selected_encodings->append(GetCanonicalEncodingNameByCommandId(*it));
-  }
-  return true;
-}