Backed out changeset c424ad1c5f94 for build failures a=backout CLOSED TREE

Backs out https://github.com/servo/servo/pull/17892

components/compositing/compositor_thread.rs

@@ -194,6 +194,5 @@ pub struct InitialCompositorState {
     pub mem_profiler_chan: mem::ProfilerChan,
     /// Instance of webrender API
     pub webrender: webrender::Renderer,
-    pub webrender_document: webrender_api::DocumentId,
-    pub webrender_api: webrender_api::RenderApi,
+    pub webrender_api_sender: webrender_api::RenderApiSender,
 }