wstrings: make l10n_util::TruncateString use string16

chrome/browser/extensions/extension_menu_manager.cc

Index: chrome/browser/extensions/extension_menu_manager.cc
diff --git a/chrome/browser/extensions/extension_menu_manager.cc b/chrome/browser/extensions/extension_menu_manager.cc
index 6cc67fa696ab4ab11c5fbb81e6625c034bfae95b..4f4d72f0b3e801ab7a1e6427218f39d19640df33 100644
--- a/chrome/browser/extensions/extension_menu_manager.cc
+++ b/chrome/browser/extensions/extension_menu_manager.cc
@@ -73,10 +73,8 @@ string16 ExtensionMenuItem::TitleWithReplacement(
   // put "%s" in titles that won't get substituted.
   ReplaceSubstringsAfterOffset(&result, 0, ASCIIToUTF16("%s"), selection);
 
-  if (result.length() > max_length) {
-    result = WideToUTF16(l10n_util::TruncateString(UTF16ToWideHack(result),
-                                                   max_length));
-  }
+  if (result.length() > max_length)
+    result = l10n_util::TruncateString(result, max_length);
   return result;
 }