Make HistoryContentsProvider results deletable

chrome/browser/autocomplete/history_url_provider.h

 // Copyright (c) 2010 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_URL_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_
 #pragma once
 
 #include <string>
 
+#include "base/compiler_specific.h"
 #include "chrome/browser/autocomplete/history_provider.h"
 #include "chrome/browser/autocomplete/history_provider_util.h"
 
 class MessageLoop;
 class Profile;
 
 namespace history {
 
 class HistoryBackend;
 class URLDatabase;
@@ skipping 123 matching lines @@
                      const std::string& languages)
     : HistoryProvider(listener, profile, "History"),
       prefixes_(GetPrefixes()),
       params_(NULL),
       languages_(languages) {}
 #endif
   // no destructor (see note above)
 
   // AutocompleteProvider
   virtual void Start(const AutocompleteInput& input,
-                     bool minimal_changes);
-  virtual void Stop();
-  virtual void DeleteMatch(const AutocompleteMatch& match);
+                     bool minimal_changes) OVERRIDE;
+  virtual void Stop() OVERRIDE;
 
   // Runs the history query on the history thread, called by the history
   // system. The history database MAY BE NULL in which case it is not
   // available and we should return no data. Also schedules returning the
   // results to the main thread
   void ExecuteWithDB(history::HistoryBackend* backend,
                      history::URLDatabase* db,
                      HistoryURLProviderParams* params);
 
   // Actually runs the autocomplete job on the given database, which is
@@ skipping 128 matching lines @@
   // parameter itself is freed once it's no longer needed.  The only reason we
   // keep this member is so we can set the cancel bit on it.
   HistoryURLProviderParams* params_;
 
   // Only used by unittests; if non-empty, overrides accept-languages in the
   // profile's pref system.
   std::string languages_;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_