Remove the Vector::append overload that takes a Vector

Source/core/editing/TextCheckingHelper.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 541 matching lines @@
         findBadGrammars(client, characters.data(), 0, grammarCheckLength, grammarResult);
     }
 
     if (grammarResult.size())
         results.swap(grammarResult);
 
     if (spellingResult.size()) {
         if (results.isEmpty())
             results.swap(spellingResult);
         else
-            results.append(spellingResult);
+            results.appendVector(spellingResult);
     }
 }
 
 bool unifiedTextCheckerEnabled(const Frame* frame)
 {
     if (!frame)
         return false;
 
     const Settings* settings = frame->settings();
     if (!settings)
         return false;
 
     return settings->unifiedTextCheckerEnabled();
 }
 
 }