Add and use a base::i18n::StringWithDirection for carrying titles.

chrome/browser/notifications/balloon_host.h

Index: chrome/browser/notifications/balloon_host.h
diff --git a/chrome/browser/notifications/balloon_host.h b/chrome/browser/notifications/balloon_host.h
index aba22e0640af0a73a909e7d058a94b84644ae3c9..0d483faf80e8b8daedec1e4aabd08d7f8073f3df 100644
--- a/chrome/browser/notifications/balloon_host.h
+++ b/chrome/browser/notifications/balloon_host.h
@@ -56,10 +56,10 @@ class BalloonHost : public RenderViewHostDelegate,
   virtual void RenderViewGone(RenderViewHost* render_view_host,
                               base::TerminationStatus status,
                               int error_code);
-  virtual void UpdateTitle(RenderViewHost* render_view_host,
-                           int32 page_id,
-                           const string16& title,
-                           WebKit::WebTextDirection title_direction) OVERRIDE {}
+  virtual void UpdateTitle(
+      RenderViewHost* render_view_host,
+      int32 page_id,
+      const base::i18n::String16WithDirection& title) OVERRIDE {}
   virtual int GetBrowserWindowID() const;
   virtual ViewType::Type GetRenderViewType() const;
   virtual RenderViewHostDelegate::View* GetViewDelegate();