PlzNavigate: support the WebRequest API

content/browser/frame_host/navigation_handle_impl.cc

Index: content/browser/frame_host/navigation_handle_impl.cc
diff --git a/content/browser/frame_host/navigation_handle_impl.cc b/content/browser/frame_host/navigation_handle_impl.cc
index 824063f5578537866e17c5e92f9baa0695283deb..03487ebf7c57ee3757afbd0c9d451eafd96203e5 100644
--- a/content/browser/frame_host/navigation_handle_impl.cc
+++ b/content/browser/frame_host/navigation_handle_impl.cc
@@ -19,6 +19,7 @@
 #include "content/common/resource_request_body_impl.h"
 #include "content/common/site_isolation_policy.h"
 #include "content/public/browser/content_browser_client.h"
+#include "content/public/browser/navigation_ui_data.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/content_client.h"
@@ -397,6 +398,9 @@ void NavigationHandleImpl::WillStartRequest(
 
   RegisterNavigationThrottles();
 
+  if (IsBrowserSideNavigationEnabled())
+    navigation_ui_data_ = GetDelegate()->GetNavigationUIData(this);
+
   // Notify each throttle of the request.
   NavigationThrottle::ThrottleCheckResult result = CheckWillStartRequest();