Make stateStore.isConnected a method

src/state-store.js

@@ -3,6 +3,7 @@
 module.exports =
 class StateStore {
   constructor (databaseName, version) {
+    this.connected = false
     this.dbPromise = new Promise((resolve) => {
       let dbOpenRequest = indexedDB.open(databaseName, version)
       dbOpenRequest.onupgradeneeded = (event) => {
@@ -10,17 +11,21 @@ class StateStore {
         db.createObjectStore('states')
       }
       dbOpenRequest.onsuccess = () => {
-        this.isConnected = true
+        this.connected = true
         resolve(dbOpenRequest.result)
       }
       dbOpenRequest.onerror = (error) => {
         console.error('Could not connect to indexedDB', error)
-        this.isConnected = false
+        this.connected = false
         resolve(null)
       }
     })
   }
 
+  isConnected () {
+    return this.connected
+  }
+
   connect () {
     return this.dbPromise.then((db) => !!db)
   }

src/text-editor.coffee

@@ -892,7 +892,7 @@ class TextEditor extends Model
   # Determine whether the user should be prompted to save before closing
   # this editor.
   shouldPromptToSave: ({windowCloseRequested, projectHasPaths}={}) ->
-    if windowCloseRequested and projectHasPaths and atom.stateStore.isConnected
+    if windowCloseRequested and projectHasPaths and atom.stateStore.isConnected()
       false
     else
       @isModified() and not @buffer.hasMultipleEditors()