Create initial browser id for compositor on startup.

1 files changed, 3 insertions, 5 deletions

diff --git a/components/constellation/constellation.rs b/components/constellation/constellation.rs
index 6fbd449a236..d1cf5fed950 100644
--- a/components/constellation/constellation.rs
+++ b/components/constellation/constellation.rs
@@ -4983,7 +4983,7 @@ where
     /// Called when the window is resized.
     fn handle_window_size_msg(
         &mut self,
-        top_level_browsing_context_id: Option<TopLevelBrowsingContextId>,
+        top_level_browsing_context_id: TopLevelBrowsingContextId,
         new_size: WindowSizeData,
         size_type: WindowSizeType,
     ) {
@@ -4992,10 +4992,8 @@ where
             new_size.initial_viewport.to_untyped()
         );
 
-        if let Some(top_level_browsing_context_id) = top_level_browsing_context_id {
-            let browsing_context_id = BrowsingContextId::from(top_level_browsing_context_id);
-            self.resize_browsing_context(new_size, size_type, browsing_context_id);
-        }
+        let browsing_context_id = BrowsingContextId::from(top_level_browsing_context_id);
+        self.resize_browsing_context(new_size, size_type, browsing_context_id);
 
         if let Some(resize_channel) = self.webdriver.resize_channel.take() {
             let _ = resize_channel.send(new_size);