RefCounted types should not have public destructors

chrome/renderer/spellchecker/spellcheck.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/spellchecker/spellcheck.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/metrics/histogram.h"
 #include "base/message_loop_proxy.h"
@@ skipping 58 matching lines @@
 
   int offset() {
     return offset_;
   }
 
   WebKit::WebTextCheckingCompletion* completion() {
     return completion_;
   }
 
  private:
+  friend class base::RefCountedThreadSafe<SpellCheckRequestParam>;
+
+  ~SpellCheckRequestParam() {}
+
   // Text to be checked in this task.
   string16 text_;
 
   // The text offset from the beginning.
   int offset_;
 
   // The interface to send the misspelled ranges to WebKit.
   WebKit::WebTextCheckingCompletion* completion_;
 
   DISALLOW_COPY_AND_ASSIGN(SpellCheckRequestParam);
@@ skipping 414 matching lines @@
 
   string16 word;
   int word_start;
   int word_length;
   while (contraction_iterator_.GetNextWord(&word, &word_start, &word_length)) {
     if (!CheckSpelling(word, tag))
       return false;
   }
   return true;
 }