Make browser_handles_top_level_requests synchronous.

content/browser/tab_contents/tab_contents.h

Index: content/browser/tab_contents/tab_contents.h
diff --git a/content/browser/tab_contents/tab_contents.h b/content/browser/tab_contents/tab_contents.h
index 2fe0ec31cacb7f5a1eed499b22db69f5eace85c5..3f520ca0daa4961436a8f7fe85b98ae016eca0b2 100644
--- a/content/browser/tab_contents/tab_contents.h
+++ b/content/browser/tab_contents/tab_contents.h
@@ -286,6 +286,11 @@ class CONTENT_EXPORT TabContents
       WindowOpenDisposition disposition,
       int64 source_frame_id,
       const content::GlobalRequestID& transferred_global_request_id) OVERRIDE;
+  virtual bool ShouldIgnoreNavigation(const GURL& url,
+                              const content::Referrer& referrer,
+                              WindowOpenDisposition disposition,
+                              int64 source_frame_id,
+                              bool is_content_initiated) OVERRIDE;
   virtual void RunJavaScriptMessage(content::RenderViewHost* rvh,
                                     const string16& message,
                                     const string16& default_prompt,