Revert of Implement a simple ThreadChecker for Mojo and add to |internal::SharedData| and |internal::Router|.

third_party/mojo/src/mojo/public/cpp/bindings/lib/router.cc

Index: third_party/mojo/src/mojo/public/cpp/bindings/lib/router.cc
diff --git a/third_party/mojo/src/mojo/public/cpp/bindings/lib/router.cc b/third_party/mojo/src/mojo/public/cpp/bindings/lib/router.cc
index fa264b784a8502c51c1d2fa52ff2001ef680bedb..5a7c7e2f97437724ca7f1284b9175ef1fb477ab8 100644
--- a/third_party/mojo/src/mojo/public/cpp/bindings/lib/router.cc
+++ b/third_party/mojo/src/mojo/public/cpp/bindings/lib/router.cc
@@ -92,13 +92,11 @@
 }
 
 bool Router::Accept(Message* message) {
-  MOJO_DCHECK(thread_checker_.CalledOnValidThread());
   MOJO_DCHECK(!message->has_flag(kMessageExpectsResponse));
   return connector_.Accept(message);
 }
 
 bool Router::AcceptWithResponder(Message* message, MessageReceiver* responder) {
-  MOJO_DCHECK(thread_checker_.CalledOnValidThread());
   MOJO_DCHECK(message->has_flag(kMessageExpectsResponse));
 
   // Reserve 0 in case we want it to convey special meaning in the future.
@@ -116,13 +114,11 @@
 }
 
 void Router::EnableTestingMode() {
-  MOJO_DCHECK(thread_checker_.CalledOnValidThread());
   testing_mode_ = true;
   connector_.set_enforce_errors_from_incoming_receiver(false);
 }
 
 bool Router::HandleIncomingMessage(Message* message) {
-  MOJO_DCHECK(thread_checker_.CalledOnValidThread());
   if (message->has_flag(kMessageExpectsResponse)) {
     if (incoming_receiver_) {
       MessageReceiverWithStatus* responder = new ResponderThunk(weak_self_);