Add ResetWithReason for AssociatedInterfaceRequest.

mojo/public/js/interface_types.js

Index: mojo/public/js/interface_types.js
diff --git a/mojo/public/js/interface_types.js b/mojo/public/js/interface_types.js
index e3c06559792edcb2c2037cb2afaa73416688937b..03ba2ba4e9374e671dd44446a4ee5a5151ab6d3e 100644
--- a/mojo/public/js/interface_types.js
+++ b/mojo/public/js/interface_types.js
@@ -66,6 +66,10 @@ define("mojo/public/js/interface_types", [
     return this.interfaceEndpointHandle.isValid();
   };
 
+  AssociatedInterfaceRequest.prototype.resetWithReason = function(reason) {
+    this.interfaceEndpointHandle.reset(reason);
+  };
+
   function isMasterInterfaceId(interfaceId) {
     return interfaceId === kMasterInterfaceId;
   }