Always use global rootView object

This removes the last few places where rootView was
looked up via jQuery selector and instead just uses
the rootView property available on the window.

src/packages/autocomplete/lib/autocomplete-view.coffee

@@ -73,7 +73,7 @@ class AutocompleteView extends SelectList
 
     @editor.abort()
     @editor.setSelectedBufferRange(@originalSelectionBufferRange)
-    @editor.rootView()?.focus() if @miniEditor.isFocused
+    rootView.focus() if @miniEditor.isFocused
 
   attach: ->
     @editor.transact()

src/packages/symbols-view/lib/tag-reader.coffee

@@ -11,7 +11,7 @@ find: (editor) ->
   word = editor.getTextInRange(editor.getCursor().getCurrentWordBufferRange())
   return [] unless word.length > 0
 
-  tagsFile = @getTagsFile(editor.rootView().project)
+  tagsFile = @getTagsFile(rootView.project)
   return [] unless tagsFile
 
   $tags.find(tagsFile, word) or []