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/script_traits/lib.rs

@@ -747,9 +747,6 @@ pub enum ConstellationMsg {
     /// Request that the constellation send the current focused top-level browsing context id,
     /// over a provided channel.
     GetFocusTopLevelBrowsingContext(IpcSender<Option<TopLevelBrowsingContextId>>),
-    /// Requests that the constellation inform the compositor of the title of the pipeline
-    /// immediately.
-    GetPipelineTitle(PipelineId),
     /// Request to load the initial page.
     InitLoadUrl(ServoUrl),
     /// Query the constellation to see if the current compositor output is stable