Update mojo sdk to rev cb6c5abfadfea0ca73dca466e2894554ac1ae144

third_party/mojo/src/mojo/public/tools/bindings/generators/dart_templates/interface_definition.tmpl

Index: third_party/mojo/src/mojo/public/tools/bindings/generators/dart_templates/interface_definition.tmpl
diff --git a/third_party/mojo/src/mojo/public/tools/bindings/generators/dart_templates/interface_definition.tmpl b/third_party/mojo/src/mojo/public/tools/bindings/generators/dart_templates/interface_definition.tmpl
index cca521d4e48342ca492307f6e20326a9f68f4660..30463b2b6a096c625bf883ae52b29538ece8078f 100644
--- a/third_party/mojo/src/mojo/public/tools/bindings/generators/dart_templates/interface_definition.tmpl
+++ b/third_party/mojo/src/mojo/public/tools/bindings/generators/dart_templates/interface_definition.tmpl
@@ -63,7 +63,11 @@ class {{interface|name}}ProxyImpl extends bindings.Proxy {
           throw 'Expected a message with a valid request Id.';
         }
         Completer c = completerMap[message.header.requestId];
-        completerMap[message.header.requestId] = null;
+        if (c == null) {
+          throw 'Message had unknown request Id: ${message.header.requestId}';
+        }
+        completerMap.remove(message.header.requestId);
+        assert(!c.isCompleted);
         c.complete(r);
         break;
 {%- endif %}
@@ -154,7 +158,7 @@ class {{interface|name}}Proxy implements bindings.ProxyBase {
       core.MojoMessagePipeEndpoint endpoint) =>
       new {{interface|name}}Proxy.fromEndpoint(endpoint);
 
-  Future close() => impl.close();
+  Future close({bool nodefer: false}) => impl.close(nodefer: nodefer);
 
   String toString() {
     return "{{interface|name}}Proxy($impl)";