Don't GC message pipes that have an in-flight request

mojo/public/tools/bindings/generators/js_templates/interface_definition.tmpl

 {%- for method in interface.methods %}
   var k{{interface.name}}_{{method.name}}_Name = {{method.ordinal}};
 {%- endfor %}
 
   function {{interface.name}}Proxy(receiver) {
     this.receiver_ = receiver;
   }
 
 {%- for method in interface.methods %}
   {{interface.name}}Proxy.prototype.{{method.name|stylize_method}} = function(
@@ skipping 14 matching lines @@
     var message = builder.finish();
     this.receiver_.accept(message);
 {%- else %}
     return new Promise(function(resolve, reject) {
       var builder = new codec.MessageWithRequestIDBuilder(
           k{{interface.name}}_{{method.name}}_Name,
           codec.align({{interface.name}}_{{method.name}}_Params.encodedSize),
           codec.kMessageExpectsResponse, 0);
       builder.encodeStruct({{interface.name}}_{{method.name}}_Params, params);
       var message = builder.finish();
-      this.receiver_.acceptWithResponder(message, {
-          accept: function(message) {
-            var reader = new codec.MessageReader(message);
-            var responseParams =
-                reader.decodeStruct({{interface.name}}_{{method.name}}_ResponseParams);
-            resolve(responseParams);
-          },
-          reject: function(result) {
-            reject(Error("Connection error: " + result));
-          },
-      }).catch(reject);
+      this.receiver_.acceptAndExpectResponse(message).then(function(message) {
+        var reader = new codec.MessageReader(message);
+        var responseParams =
+            reader.decodeStruct({{interface.name}}_{{method.name}}_ResponseParams);
+        resolve(responseParams);
+      }).catch(function(result) {
+        reject(Error("Connection error: " + result));
+      });
     }.bind(this));
 {%- endif %}
   };
 {%- endfor %}
 
   function {{interface.name}}Stub() {
   }
 
   {{interface.name}}Stub.prototype.accept = function(message) {
     var reader = new codec.MessageReader(message);
@@ skipping 134 matching lines @@
 {%- from "enum_definition.tmpl" import enum_def -%}
 {%- for enum in interface.enums %}
   {{ enum_def("%s.%s"|format(interface.name, enum.name), enum) }}
 {%-  endfor %}
   {{interface.name}}Stub.prototype.validator = validate{{interface.name}}Request;
 {%- if interface|has_callbacks %}
   {{interface.name}}Proxy.prototype.validator = validate{{interface.name}}Response;
 {%- else %}
   {{interface.name}}Proxy.prototype.validator = null;
 {%- endif %}