Narrow scope and rename flag

src/atom.coffee

@@ -34,8 +34,6 @@ class Atom extends Model
     atom = @deserialize(@loadState(mode)) ? new this({mode, @version})
     atom.deserializeTimings.atom = Date.now() -  startTime
 
-    Object.defineProperty(atom, "hasTiledEditor", value: true)
-
     if includeDeprecatedAPIs
       workspaceViewDeprecationMessage = """
         atom.workspaceView is no longer available.

src/text-editor-element.coffee

@@ -17,6 +17,7 @@ class TextEditorElement extends HTMLElement
   attached: false
   tileSize: null
   focusOnAttach: false
+  hasTiledRendering: true
 
   createdCallback: ->
     @emitter = new Emitter