Use ICU for string pluralization in the extension permission dialog.

ui/base/l10n/l10n_util.h

Index: ui/base/l10n/l10n_util.h
diff --git a/ui/base/l10n/l10n_util.h b/ui/base/l10n/l10n_util.h
index 7c26b80346714764111bdb1039333808b662eec3..d7753365d003a896aa03bc504132c53f09afeadc 100644
--- a/ui/base/l10n/l10n_util.h
+++ b/ui/base/l10n/l10n_util.h
@@ -139,6 +139,14 @@ UI_EXPORT string16 GetStringFUTF16(int message_id,
 UI_EXPORT string16 GetStringFUTF16Int(int message_id, int a);
 string16 GetStringFUTF16Int(int message_id, int64 a);
 
+// Get a resource string using |number| to decide which of |message_ids| should
+// be used. |message_ids| must be size 6 and in order: default, singular, zero,
+// two, few, many.
+UI_EXPORT string16 GetPluralStringFUTF16(const std::vector<int>& message_ids,
+                                         int number);
+UI_EXPORT std::string GetPluralStringFUTF8(const std::vector<int>& message_ids,
+                                           int number);
+
 // In place sorting of string16 strings using collation rules for |locale|.
 UI_EXPORT void SortStrings16(const std::string& locale,
                              std::vector<string16>* strings);