RefCounted types should not have public destructors, chrome/browser/ part 6

chrome/browser/autocomplete/history_provider.h

 // 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.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_HISTORY_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_PROVIDER_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/autocomplete/autocomplete.h"
 
 // This class is a base class for the history autocomplete providers and
 // provides functions useful to all derived classes.
 class HistoryProvider : public AutocompleteProvider {
  public:
   virtual void DeleteMatch(const AutocompleteMatch& match) OVERRIDE;
 
  protected:
   HistoryProvider(ACProviderListener* listener,
                   Profile* profile,
                   const char* name);
+  virtual ~HistoryProvider();
 
   // Fixes up user URL input to make it more possible to match against.  Among
   // many other things, this takes care of the following:
   // * Prepending file:// to file URLs
   // * Converting drive letters in file URLs to uppercase
   // * Converting case-insensitive parts of URLs (like the scheme and domain)
   //   to lowercase
   // * Convert spaces to %20s
   // Note that we don't do this in AutocompleteInput's constructor, because if
   // e.g. we convert a Unicode hostname to punycode, other providers will show
@@ skipping 13 matching lines @@
   // FixupUserInput(). This method returns true if
   // |input.prevent_inline_autocomplete()| is true, or the input text contains
   // trailing whitespace, or if always_prevent_inline_autocomplete is true.
   bool PreventInlineAutocomplete(const AutocompleteInput& input);
 
   // If true, we always prevent inline autocompletions.
   bool always_prevent_inline_autocomplete_;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_PROVIDER_H_