Bug 1336011 part.3 Create an alias of the type of mDocStateListeners r=smaug

MozReview-Commit-ID: L0TczDcH4t8

--HG--
extra : rebase_source : 0a250056797c6fb760e7aa674565d3e71df6f568

editor/libeditor/EditorBase.cpp

@@ -2622,8 +2622,7 @@ EditorBase::NotifyDocumentListeners(
     return NS_OK;
   }
 
-  nsTArray<OwningNonNull<nsIDocumentStateListener>>
-    listeners(mDocStateListeners);
+  AutoDocumentStateListenerArray listeners(mDocStateListeners);
   nsresult rv = NS_OK;
 
   switch (aNotificationType) {

editor/libeditor/EditorBase.h

@@ -1011,7 +1011,9 @@ protected:
             AutoEditorObserverArray;
   AutoEditorObserverArray mEditorObservers;
   // Listen to overall doc state (dirty or not, just created, etc.).
-  nsTArray<OwningNonNull<nsIDocumentStateListener>> mDocStateListeners;
+  typedef AutoTArray<OwningNonNull<nsIDocumentStateListener>, 1>
+            AutoDocumentStateListenerArray;
+  AutoDocumentStateListenerArray mDocStateListeners;
 
   // Cached selection for AutoSelectionRestorer.
   SelectionState mSavedSel;