Use ICU for string pluralization in the extension permission dialog.

chrome/common/extensions/permissions/permission_message.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/common/extensions/permissions/permission_message.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 27 matching lines @@
     case 3:
       message_id = kHosts3;
       message = l10n_util::GetStringFUTF16(IDS_EXTENSION_PROMPT_WARNING_3_HOSTS,
                                            UTF8ToUTF16(host_list[0]),
                                            UTF8ToUTF16(host_list[1]),
                                            UTF8ToUTF16(host_list[2]));
       break;
     default:
       message_id = kHosts4OrMore;
 
-    message = l10n_util::GetStringFUTF16(
-        IDS_EXTENSION_PROMPT_WARNING_HOSTS,
-        base::IntToString16(host_list.size()));
+      const int kRetainedFilesMessageIDs[6] = {
+          IDS_EXTENSION_PROMPT_WARNING_HOSTS_DEFAULT,
+          IDS_EXTENSION_PROMPT_WARNING_HOST_SINGULAR,
+          IDS_EXTENSION_PROMPT_WARNING_HOSTS_ZERO,
+          IDS_EXTENSION_PROMPT_WARNING_HOSTS_TWO,
+          IDS_EXTENSION_PROMPT_WARNING_HOSTS_FEW,
+          IDS_EXTENSION_PROMPT_WARNING_HOSTS_MANY,
+      };
+      std::vector<int> message_ids;
+      for (size_t i = 0; i < arraysize(kRetainedFilesMessageIDs); i++) {
+        message_ids.push_back(kRetainedFilesMessageIDs[i]);
+      }
+      message = l10n_util::GetPluralStringFUTF16(message_ids, host_list.size());
 
-    for (size_t i = 0; i < host_list.size(); ++i) {
-      if (i > 0)
-        details += ASCIIToUTF16("\n");
-      details += l10n_util::GetStringFUTF16(
-          IDS_EXTENSION_PROMPT_WARNING_HOST_LIST_ENTRY,
-          UTF8ToUTF16(host_list[i]));
-    }
+      for (size_t i = 0; i < host_list.size(); ++i) {
+        if (i > 0)
+          details += ASCIIToUTF16("\n");
+        details += l10n_util::GetStringFUTF16(
+            IDS_EXTENSION_PROMPT_WARNING_HOST_LIST_ENTRY,
+            UTF8ToUTF16(host_list[i]));
+      }
   }
 
   return PermissionMessage(message_id, message, details);
 }
 
 PermissionMessage::PermissionMessage(
     PermissionMessage::ID id, const string16& message)
   : id_(id),
     message_(message) {
 }
 
 PermissionMessage::PermissionMessage(
     PermissionMessage::ID id, const string16& message, const string16& details)
   : id_(id),
     message_(message),
     details_(details) {
 }
 
 PermissionMessage::~PermissionMessage() {}
 
 }  // namespace extensions