Mojo C++ bindings: remove the lock in MultiplexRouter if it only serves a single interface.

mojo/public/cpp/bindings/lib/binding_state.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/bindings/lib/binding_state.h"
 
 #include "mojo/public/cpp/bindings/lib/control_message_proxy.h"
 
 namespace mojo {
 namespace internal {
@@ skipping 128 matching lines @@
 void MultiplexedBindingState::BindInternal(
     ScopedMessagePipeHandle handle,
     scoped_refptr<base::SingleThreadTaskRunner> runner,
     const char* interface_name,
     std::unique_ptr<MessageReceiver> request_validator,
     bool has_sync_methods,
     MessageReceiverWithResponderStatus* stub,
     uint32_t interface_version) {
   DCHECK(!router_);
 
-  router_ = new internal::MultiplexRouter(false, std::move(handle), runner);
+  router_ = new MultiplexRouter(
+      std::move(handle), MultiplexRouter::MULTI_INTERFACE, false, runner);
   router_->SetMasterInterfaceName(interface_name);
 
   endpoint_client_.reset(new InterfaceEndpointClient(
       router_->CreateLocalEndpointHandle(kMasterInterfaceId), stub,
       std::move(request_validator), has_sync_methods, std::move(runner),
       interface_version));
 }
 
 }  // namesapce internal
 }  // namespace mojo