Move check of isReady to native code

lib/browser/api/session.js

@@ -1,18 +1,9 @@
 const {EventEmitter} = require('events')
 const {app} = require('electron')
-const bindings = process.atomBinding('session')
+const {fromPartition, _setWrapSession} = process.atomBinding('session')
 
 const PERSIST_PREFIX = 'persist:'
 
-// Wrapper of binding.fromPartition that checks for ready event.
-const fromPartition = function (partition, persist) {
-  if (!app.isReady()) {
-    throw new Error('session module can only be used when app is ready')
-  }
-
-  return bindings.fromPartition(partition, persist)
-}
-
 // Returns the Session from |partition| string.
 exports.fromPartition = function (partition = '') {
   if (partition === '') return exports.defaultSession
@@ -32,10 +23,9 @@ Object.defineProperty(exports, 'defaultSession', {
   }
 })
 
-const wrapSession = function (session) {
+// Wraps native Session class.
+_setWrapSession(function (session) {
   // Session is an EventEmitter.
   Object.setPrototypeOf(session, EventEmitter.prototype)
   app.emit('session-created', session)
-}
-
-bindings._setWrapSession(wrapSession)
+})