Make browser_handles_top_level_requests synchronous.

content/public/browser/web_contents_delegate.h

Index: content/public/browser/web_contents_delegate.h
diff --git a/content/public/browser/web_contents_delegate.h b/content/public/browser/web_contents_delegate.h
index 49e833ddd3c5fa976753d793d3f6b46e71de2bac..02fe3128462afef9a34e4f85421dcb3be39e68d9 100644
--- a/content/public/browser/web_contents_delegate.h
+++ b/content/public/browser/web_contents_delegate.h
@@ -33,6 +33,7 @@ class BrowserContext;
 class ColorChooser;
 class DownloadItem;
 class JavaScriptDialogCreator;
+struct Referrer;
 class RenderViewHost;
 class WebContents;
 class WebIntentsDispatcher;
@@ -77,6 +78,16 @@ class CONTENT_EXPORT WebContentsDelegate {
   virtual WebContents* OpenURLFromTab(WebContents* source,
                                       const OpenURLParams& params);
 
+  // Returns false if the navigation in question is to proceed and true if it
+  // is to be ignored by the renderer.
+  virtual bool ShouldIgnoreNavigation(
+      WebContents* source,
+      const GURL& url,
+      const content::Referrer& referrer,
+      WindowOpenDisposition disposition,
+      bool is_content_initiated,
+      content::PageTransition transition_type);
+
   // Called to inform the delegate that the tab content's navigation state
   // changed. The |changed_flags| indicates the parts of the navigation state
   // that have been updated, and is any combination of the