Bug 1874215 - Don't set the Rust max log level r=markh

Increasing the level to DEBUG is causing slowdowns for the necko code
and it doesn't seem like we're actually getting the Rust records into
the sync logs anyways.

Differential Revision: https://phabricator.services.mozilla.com/D199259

services/common/app_services_logger/src/lib.rs

@@ -46,11 +46,6 @@ impl AppServicesLogger {
     xpcom_method!(register => Register(target: *const nsAString, logger: *const mozIServicesLogSink));
     fn register(&self, target: &nsAString, logger: &mozIServicesLogSink) -> Result<(), nsresult> {
         let log_sink_logger = LogSink::with_logger(Some(logger))?;
-        let max_level = cmp::max(log::max_level(), log_sink_logger.max_level);
-
-        // Note: This will only work if the max_level is lower than the compile-time
-        // max_level_* filter.
-        log::set_max_level(max_level);
 
         ensure_observing_shutdown();