Allow asynchronous deferral in NavigationSimulator

content/browser/frame_host/navigation_request.h

Index: content/browser/frame_host/navigation_request.h
diff --git a/content/browser/frame_host/navigation_request.h b/content/browser/frame_host/navigation_request.h
index 24980b97da4696d2062a99ef41757bc9237454ce..32512b12640af58f8b610457c1082b781c355909 100644
--- a/content/browser/frame_host/navigation_request.h
+++ b/content/browser/frame_host/navigation_request.h
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "content/browser/frame_host/navigation_entry_impl.h"
+#include "content/browser/frame_host/navigation_handle_impl.h"
 #include "content/browser/loader/navigation_url_loader_delegate.h"
 #include "content/common/content_export.h"
 #include "content/common/frame_message_enums.h"
@@ -161,9 +162,9 @@ class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
   void TransferNavigationHandleOwnership(
       RenderFrameHostImpl* render_frame_host);
 
-  void set_on_start_checks_complete_closure_for_testing(
-      const base::Closure& closure) {
-    on_start_checks_complete_closure_ = closure;
+  void set_on_checks_complete_callback_for_testing(
+      const NavigationHandleImpl::ThrottleChecksFinishedCallback& callback) {
+    on_checks_complete_callback_ = callback;
   }
 
  private:
@@ -253,7 +254,8 @@ class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
   scoped_refptr<ResourceResponse> response_;
   std::unique_ptr<StreamHandle> body_;
 
-  base::Closure on_start_checks_complete_closure_;
+  NavigationHandleImpl::ThrottleChecksFinishedCallback
+      on_checks_complete_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(NavigationRequest);
 };