Make browser_handles_top_level_requests synchronous.

content/public/browser/render_view_host_delegate.h

Index: content/public/browser/render_view_host_delegate.h
diff --git a/content/public/browser/render_view_host_delegate.h b/content/public/browser/render_view_host_delegate.h
index dd36549a70e620ba75cb6c89ae3ed33b53b0a462..14d0437d1dc2281be206e82fa6174145e4a4c553 100644
--- a/content/public/browser/render_view_host_delegate.h
+++ b/content/public/browser/render_view_host_delegate.h
@@ -14,6 +14,7 @@
 #include "base/process_util.h"
 #include "base/string16.h"
 #include "content/common/content_export.h"
+#include "content/public/common/page_transition_types.h"
 #include "content/public/common/view_type.h"
 #include "ipc/ipc_channel.h"
 #include "net/base/load_states.h"
@@ -297,6 +298,14 @@ class CONTENT_EXPORT RenderViewHostDelegate : public IPC::Channel::Listener {
       int64 source_frame_id,
       const content::GlobalRequestID& old_request_id) {}
 
+  // The page is asking the browser to decide if the navigation should be
+  // ignored (only happens if the appropriate renderer pref is set).
+  virtual bool ShouldIgnoreNavigation(const GURL& url,
+                              const content::Referrer& referrer,
+                              WindowOpenDisposition disposition,
+                              int64 source_frame_id,
+                              bool is_content_initiated);
+
   // A javascript message, confirmation or prompt should be shown.
   virtual void RunJavaScriptMessage(RenderViewHost* rvh,
                                     const string16& message,