Dereference remote objects with native code

Previously we rely on the v8util.setDestructor to dereference the remote
objects in JavaScript, however as documented in V8, it is forbidden to
call V8 APIs in object's destructor (e.g. the weak callback), and doing
so would result in crashs.

This commit removes the JavaScript setDestructor method, and avoids
doing the dereference work with V8.

lib/renderer/api/remote.js

@@ -210,9 +210,7 @@ let metaToValue = function (meta) {
 
       // Track delegate object's life time, and tell the browser to clean up
       // when the object is GCed.
-      v8Util.setDestructor(ret, function () {
-        ipcRenderer.send('ELECTRON_BROWSER_DEREFERENCE', meta.id)
-      })
+      v8Util.setRemoteObjectFreer(ret, meta.id)
 
       // Remember object's id.
       v8Util.setHiddenValue(ret, 'atomId', meta.id)