Use OnceCallback for Mojo binding connection error handlers.

mojo/public/cpp/bindings/associated_interface_ptr.h

Index: mojo/public/cpp/bindings/associated_interface_ptr.h
diff --git a/mojo/public/cpp/bindings/associated_interface_ptr.h b/mojo/public/cpp/bindings/associated_interface_ptr.h
index 0344bda31fba0380cd4e3a39e88bde090f66ef24..2ca5283658cf70c7382864d5d9f8b022c9eb142c 100644
--- a/mojo/public/cpp/bindings/associated_interface_ptr.h
+++ b/mojo/public/cpp/bindings/associated_interface_ptr.h
@@ -136,13 +136,14 @@ class AssociatedInterfacePtr {
   //
   // This method may only be called after the AssociatedInterfacePtr has been
   // bound.
-  void set_connection_error_handler(const base::Closure& error_handler) {
-    internal_state_.set_connection_error_handler(error_handler);
+  void set_connection_error_handler(base::OnceClosure error_handler) {
+    internal_state_.set_connection_error_handler(std::move(error_handler));
   }
 
   void set_connection_error_with_reason_handler(
-      const ConnectionErrorWithReasonCallback& error_handler) {
-    internal_state_.set_connection_error_with_reason_handler(error_handler);
+      ConnectionErrorWithReasonCallback error_handler) {
+    internal_state_.set_connection_error_with_reason_handler(
+        std::move(error_handler));
   }
 
   // Unbinds and returns the associated interface pointer information which