Convert infobar APIs to UTF-16.

chrome/browser/gtk/infobar_gtk.h

Index: chrome/browser/gtk/infobar_gtk.h
diff --git a/chrome/browser/gtk/infobar_gtk.h b/chrome/browser/gtk/infobar_gtk.h
index ce1762ace297afb9c86b9eea018bedc6ad611796..194c39b632a098f83988a9bf8792460b1581f224 100644
--- a/chrome/browser/gtk/infobar_gtk.h
+++ b/chrome/browser/gtk/infobar_gtk.h
@@ -73,8 +73,8 @@ class InfoBar : public SlideAnimatorGtk::Delegate,
   // or right aligned in the infobar if |link_offset| is |npos|. |link_padding|
   // pixels are inserted around the link (pass 0 for not padding). If a link
   // is supplied, |link_callback| must not be null. It will be invoked on click.
-  void AddLabelAndLink(const std::wstring& display_text,
-                       const std::wstring& link,
+  void AddLabelAndLink(const string16& display_text,
+                       const string16& link,
                        size_t link_offset,
                        guint link_padding,
                        GCallback link_callback);