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

content/browser/tab_contents/interstitial_page.h

Index: content/browser/tab_contents/interstitial_page.h
diff --git a/content/browser/tab_contents/interstitial_page.h b/content/browser/tab_contents/interstitial_page.h
index 0d5e0436d420dbf3ec205646f1547336e57088ab..7523050ffbf63bf43961e3d66446458b920cbf7d 100644
--- a/content/browser/tab_contents/interstitial_page.h
+++ b/content/browser/tab_contents/interstitial_page.h
@@ -128,10 +128,10 @@ class InterstitialPage : public NotificationObserver,
                               int error_code);
   virtual void DidNavigate(RenderViewHost* render_view_host,
                            const ViewHostMsg_FrameNavigate_Params& params);
-  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 void DomOperationResponse(const std::string& json_string,
                                     int automation_id);
   virtual RendererPreferences GetRendererPrefs(Profile* profile) const;