Translate: Move label parsing logic into common code.

app/l10n_util.cc

Index: app/l10n_util.cc
diff --git a/app/l10n_util.cc b/app/l10n_util.cc
index 1feb09dee77f8c0da8e77e573195700ec7b02ab4..8d418d2a96e75b3825bf774e126dcaf543e81622 100644
--- a/app/l10n_util.cc
+++ b/app/l10n_util.cc
@@ -705,6 +705,13 @@ std::wstring GetStringF(int message_id,
                                 string16(), string16(), offsets));
 }
 
+string16 GetStringFUTF16(int message_id,
+                        const string16& a,
+                        const string16& b,
+                        std::vector<size_t>* offsets) {
+  return GetStringF(message_id, a, b, string16(), string16(), offsets);
+}
+
 std::wstring GetStringF(int message_id, int a) {
   return GetStringF(message_id, IntToWString(a));
 }