Stop history search going on beyond the start of history....

chrome/browser/dom_ui/history_ui.h

 // Copyright (c) 2006-2008 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_DOM_UI_HISTORY_UI_H__
 #define CHROME_BROWSER_DOM_UI_HISTORY_UI_H__
 
 #include "base/scoped_ptr.h"
 #include "chrome/browser/browsing_data_remover.h"
 #include "chrome/browser/dom_ui/chrome_url_data_manager.h"
@@ skipping 56 matching lines @@
   // Figure out the query options for a month-wide query.
   history::QueryOptions CreateMonthQueryOptions(int month);
 
   // Current search text.
   std::wstring search_text_;
 
   // Browsing history remover
   scoped_ptr<BrowsingDataRemover> remover_;
 
   // Our consumer for the history service.
-  CancelableRequestConsumerTSimple<PageUsageData*> cancelable_consumer_;
+  CancelableRequestConsumerT<int, 0> cancelable_consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowsingHistoryHandler);
 };
 
 class HistoryUI : public DOMUI {
  public:
   explicit HistoryUI(DOMUIContents* contents);
 
   // Return the URL for the front page of this UI.
   static GURL GetBaseURL();
 
   // Return the URL for a given search term.
   static const GURL GetHistoryURLWithSearchText(const std::wstring& text);
 
   // DOMUI Implementation
   virtual void Init();
 
  private:
 
   DISALLOW_COPY_AND_ASSIGN(HistoryUI);
 };
 
 #endif  // CHROME_BROWSER_DOM_UI_HISTORY_UI_H__