Use OnceCallback for Mojo binding connection error handlers.

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

 // Copyright 2017 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/associated_binding.h"
 #include "base/single_thread_task_runner.h"
 
 namespace mojo {
 
 AssociatedBindingBase::AssociatedBindingBase() {}
@@ skipping 10 matching lines @@
 }
 
 void AssociatedBindingBase::CloseWithReason(uint32_t custom_reason,
                                             const std::string& description) {
   if (endpoint_client_)
     endpoint_client_->CloseWithReason(custom_reason, description);
   Close();
 }
 
 void AssociatedBindingBase::set_connection_error_handler(
-    const base::Closure& error_handler) {
+    base::OnceClosure error_handler) {
   DCHECK(is_bound());
-  endpoint_client_->set_connection_error_handler(error_handler);
+  endpoint_client_->set_connection_error_handler(std::move(error_handler));
 }
 
 void AssociatedBindingBase::set_connection_error_with_reason_handler(
-    const ConnectionErrorWithReasonCallback& error_handler) {
+    ConnectionErrorWithReasonCallback error_handler) {
   DCHECK(is_bound());
-  endpoint_client_->set_connection_error_with_reason_handler(error_handler);
+  endpoint_client_->set_connection_error_with_reason_handler(
+      std::move(error_handler));
 }
 
 void AssociatedBindingBase::FlushForTesting() {
   endpoint_client_->FlushForTesting();
 }
 
 void AssociatedBindingBase::BindImpl(
     ScopedInterfaceEndpointHandle handle,
     MessageReceiverWithResponderStatus* receiver,
     std::unique_ptr<MessageReceiver> payload_validator,
     bool expect_sync_requests,
     scoped_refptr<base::SingleThreadTaskRunner> runner,
     uint32_t interface_version) {
   if (!handle.is_valid()) {
     endpoint_client_.reset();
     return;
   }
 
   endpoint_client_.reset(new InterfaceEndpointClient(
       std::move(handle), receiver, std::move(payload_validator),
       expect_sync_requests, std::move(runner), interface_version));
 }
 
 }  // namespace mojo