Add a blocking version of the sync promo dialog

chrome/browser/ui/views/html_dialog_view.h

Index: chrome/browser/ui/views/html_dialog_view.h
diff --git a/chrome/browser/ui/views/html_dialog_view.h b/chrome/browser/ui/views/html_dialog_view.h
index fb5f3ceeb430d6113bed6f852d8db7480b91615c..99da6c9330546e27a7a46b56c58696a3c0aee88c 100644
--- a/chrome/browser/ui/views/html_dialog_view.h
+++ b/chrome/browser/ui/views/html_dialog_view.h
@@ -88,6 +88,14 @@ class HtmlDialogView
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event)
       OVERRIDE;
   virtual void CloseContents(content::WebContents* source) OVERRIDE;
+  virtual content::WebContents* OpenURLFromTab(
+      content::WebContents* source,
+      const content::OpenURLParams& params) OVERRIDE;
+  virtual void AddNewContents(content::WebContents* source,
+                              content::WebContents* new_contents,
+                              WindowOpenDisposition disposition,
+                              const gfx::Rect& initial_pos,
+                              bool user_gesture) OVERRIDE;
 
  protected:
   // Register accelerators for this dialog.