PlzNavigate: store POST data in the FrameNavigationEntry

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 c8bb29613a1831eb725568ec6aa831858727b426..1f4994a897206045d6692f65eb7604029bd71487 100644
--- a/content/browser/frame_host/navigation_request.h
+++ b/content/browser/frame_host/navigation_request.h
@@ -230,6 +230,9 @@ class CONTENT_EXPORT NavigationRequest : public NavigationURLLoaderDelegate {
   bool is_view_source_;
   int bindings_;
 
+  // This is kept to be sent to the renderer on commit.
+  scoped_refptr<ResourceRequestBody> post_data_;
+
   // The type of SiteInstance associated with this navigation.
   AssociatedSiteInstanceType associated_site_instance_type_;