Fix _wrapDartFunction to call the JS set method directly. At one point this code was previously sur…

pkg/dev_compiler/lib/js/amd/dart_sdk.js

Index: pkg/dev_compiler/lib/js/amd/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/amd/dart_sdk.js b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
index 19c7a777a833e3309bcbc1b7c0df3790aa12c49e..c2cb69796da24ba6a63bbd4832294ccc15ea9750 100644
--- a/pkg/dev_compiler/lib/js/amd/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
@@ -36890,7 +36890,7 @@ define([], function() {
       let args = Array.prototype.map.call(arguments, js._convertToDart);
       return js._convertToJS(f(...args));
     };
-    dart.dsetindex(js._dartProxies, wrapper, f);
+    js._dartProxies.set(wrapper, f);
     return wrapper;
   };
   dart.fn(js._wrapDartFunction, dynamicTodynamic$());