History provider: style cleanup

chrome/browser/autocomplete/history_quick_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_QUICK_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_
+#pragma once
 
 #include "chrome/browser/autocomplete/autocomplete.h"
 
 // This class is an autocomplete provider (a pseudo-internal component of
 // the history system) which quickly (and synchronously) provides matching
 // results from recently or frequently visited sites in the profile's
 // history.
 //
 // TODO(mrossetti): Review to see if the following applies since we're not
 // using the database during the autocomplete pass.
@@ skipping 13 matching lines @@
   // no destructor (see note above)
 
   // AutocompleteProvider
   void Start(const AutocompleteInput& input, bool minimal_changes);
 
  private:
   ~HistoryQuickProvider() {}
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_