Auto merge of #17686 - paulrouget:rm_Title, r=jdm

remove the ability to request for the title

If we offer the ability to request info like these, we need to expose a lot of other getters, like url, loading state, favicon, …

It's up to the embedder to keep track of the state of a browser. So let's keep that consistent.

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components/compositing/compositor.rs

@@ -463,7 +463,6 @@ impl<Window: WindowMethods> IOCompositor<Window> {
              ShutdownState::NotShuttingDown) => {
                 self.set_frame_tree(&frame_tree);
                 self.send_viewport_rects();
-                self.title_for_main_frame();
             }
 
             (Msg::ScrollFragmentPoint(scroll_root_id, point, _),
@@ -1659,17 +1658,6 @@ impl<Window: WindowMethods> IOCompositor<Window> {
         // TODO(gw): Access via WR.
         1.0
     }
-
-    pub fn title_for_main_frame(&self) {
-        let root_pipeline_id = match self.root_pipeline {
-            None => return,
-            Some(ref root_pipeline) => root_pipeline.id,
-        };
-        let msg = ConstellationMsg::GetPipelineTitle(root_pipeline_id);
-        if let Err(e) = self.constellation_chan.send(msg) {
-            warn!("Failed to send pipeline title ({}).", e);
-        }
-    }
 }