Bug 1497619 - Restore thread check in process_thread_impl.cc; r=ng

Not not really needed.

Differential Revision: https://phabricator.services.mozilla.com/D14097

--HG--
extra : moz-landing-system : lando

media/webrtc/trunk/webrtc/modules/utility/source/process_thread_impl.cc

@@ -117,7 +117,7 @@ void ProcessThreadImpl::PostTask(std::unique_ptr<rtc::QueuedTask> task) {
 
 void ProcessThreadImpl::RegisterModule(Module* module,
                                        const rtc::Location& from) {
-  // RTC_DCHECK(thread_checker_.CalledOnValidThread());  Not really needed
+  RTC_DCHECK(thread_checker_.CalledOnValidThread());
   RTC_DCHECK(module) << from.ToString();
 
 #if RTC_DCHECK_IS_ON