Add methods to NavigationHandle to allow refactoring webNavigation to use it.

content/browser/frame_host/navigator_impl.cc

Index: content/browser/frame_host/navigator_impl.cc
diff --git a/content/browser/frame_host/navigator_impl.cc b/content/browser/frame_host/navigator_impl.cc
index 960ef9150e66aee0847045a0bcaaf7df3e28bf35..7457ed9dd47e8308d1c175a5c5cad3e42ca70917 100644
--- a/content/browser/frame_host/navigator_impl.cc
+++ b/content/browser/frame_host/navigator_impl.cc
@@ -152,7 +152,10 @@ void NavigatorImpl::DidStartProvisionalLoad(
   }
 
   render_frame_host->SetNavigationHandle(NavigationHandleImpl::Create(
-      validated_url, render_frame_host->frame_tree_node(), navigation_start));
+      validated_url, render_frame_host->frame_tree_node(),
+      false,             // is_synchronous
+      is_iframe_srcdoc,  // is_srcdoc
+      navigation_start));
 }
 
 void NavigatorImpl::DidFailProvisionalLoadWithError(