Use OnceCallback for Mojo binding connection error handlers.

mojo/public/cpp/bindings/binding.h

Index: mojo/public/cpp/bindings/binding.h
diff --git a/mojo/public/cpp/bindings/binding.h b/mojo/public/cpp/bindings/binding.h
index 5e4bb2696e992c96db65d5b8620bcbc389ee0815..3da96aa127918db73d6d0d23ba9a6ecdda637ad1 100644
--- a/mojo/public/cpp/bindings/binding.h
+++ b/mojo/public/cpp/bindings/binding.h
@@ -184,15 +184,16 @@ class Binding {
   // This method may only be called after this Binding has been bound to a
   // message pipe. The error handler will be reset when this Binding is unbound
   // or closed.
-  void set_connection_error_handler(const base::Closure& error_handler) {
+  void set_connection_error_handler(base::OnceClosure error_handler) {
     DCHECK(is_bound());
-    internal_state_.set_connection_error_handler(error_handler);
+    internal_state_.set_connection_error_handler(std::move(error_handler));
   }
 
   void set_connection_error_with_reason_handler(
-      const ConnectionErrorWithReasonCallback& error_handler) {
+      ConnectionErrorWithReasonCallback error_handler) {
     DCHECK(is_bound());
-    internal_state_.set_connection_error_with_reason_handler(error_handler);
+    internal_state_.set_connection_error_with_reason_handler(
+        std::move(error_handler));
   }
 
   // Returns the interface implementation that was previously specified. Caller