Make HistoryContentsProvider results deletable

chrome/browser/autocomplete/history_contents_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_CONTENTS_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_CONTENTS_PROVIDER_H_
 #pragma once
 
-#include "chrome/browser/autocomplete/autocomplete.h"
+#include "chrome/browser/autocomplete/history_provider.h"
 #include "chrome/browser/history/history.h"
 
 namespace bookmark_utils {
 struct TitleMatch;
 }
 
 // HistoryContentsProvider is an AutocompleteProvider that provides results from
 // the contents (body and/or title) of previously visited pages.
 // HistoryContentsProvider gets results from two sources:
 // . HistoryService: this provides results for matches in the body/title of
 //   previously viewed pages. This is asynchronous.
 // . BookmarkModel: provides results for matches in the titles of bookmarks.
 //   This is synchronous.
-class HistoryContentsProvider : public AutocompleteProvider {
+class HistoryContentsProvider : public HistoryProvider {
  public:
   HistoryContentsProvider(ACProviderListener* listener, Profile* profile);
 
   // As necessary asks the history service for the relevant results. When
   // done SetResults is invoked.
   virtual void Start(const AutocompleteInput& input,
-                     bool minimal_changes);
-
-  virtual void Stop();
+                     bool minimal_changes) OVERRIDE;
+  virtual void Stop() OVERRIDE;
 
   // Returns the total number of matches available in the database, up to
   // kMaxMatchCount, whichever is smaller.
   // Return value is incomplete if done() returns false.
   size_t db_match_count() const { return results_.size(); }
 
   // The maximum match count we'll report. If the db_match_count is greater
   // than this, it will be clamped to this result.
   static const size_t kMaxMatchCount = 50;
 
@@ skipping 50 matching lines @@
   // Whether results_ is valid (so we can tell invalid apart from empty).
   bool have_results_;
 
   // Current query string.
   std::wstring query_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryContentsProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_CONTENTS_PROVIDER_H_