PlzNavigate: send SourceLocation when mixed content is found

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index a1b6e73d4acca45a20cb1aa7a0b678bd3e0a695a..20ed9894e491a10bec1c307ff21f18fa1292790f 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -418,6 +418,11 @@ void NavigationRequest::CreateNavigationHandle(int pending_nav_entry_id) {
     navigation_handle_->set_searchable_form_encoding(
         begin_params_.searchable_form_encoding);
   }
+
+  if (common_params_.source_location) {
+    navigation_handle_->set_source_location(
+        common_params_.source_location.value());
+  }
 }
 
 void NavigationRequest::TransferNavigationHandleOwnership(