net: Remove process_request_eof (#43477)

This is no longer present in the spec. Instead, the
`process_request_body` is the new way. These two
methods were called right after each other and there was only 1
implementation in `htmlvideoelement`. That implementation is now moved
to `process_request_body` and hence we can remove the unnecessary
method.

Testing: It compiles

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

components/script/script_thread.rs

@@ -3875,8 +3875,7 @@ impl ScriptThread {
             FetchResponseMsg::ProcessCspViolations(request_id, violations) => {
                 self.handle_csp_violations(pipeline_id, request_id, violations)
             },
-            FetchResponseMsg::ProcessRequestBody(..) | FetchResponseMsg::ProcessRequestEOF(..) => {
-            },
+            FetchResponseMsg::ProcessRequestBody(..) => {},
         }
     }