Remove listener_ from AutocompleteProvider base class

chrome/browser/autocomplete/history_quick_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_QUICK_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/history_provider.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/history/in_memory_url_index.h"
 #include "components/autocomplete/autocomplete_input.h"
 
 class Profile;
 
 namespace history {
 class ScoredHistoryMatch;
 }  // namespace history
 
 // 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.
 class HistoryQuickProvider : public HistoryProvider {
  public:
-  HistoryQuickProvider(AutocompleteProviderListener* listener,
-                       Profile* profile);
+  explicit HistoryQuickProvider(Profile* profile);
 
   // AutocompleteProvider. |minimal_changes| is ignored since there is no asynch
   // completion performed.
   virtual void Start(const AutocompleteInput& input,
                      bool minimal_changes) OVERRIDE;
 
   // Disable this provider. For unit testing purposes only. This is required
   // because this provider is closely associated with the HistoryURLProvider
   // and in order to properly test the latter the HistoryQuickProvider must
   // be disabled.
@@ skipping 30 matching lines @@
   // Only used for testing.
   scoped_ptr<history::InMemoryURLIndex> index_for_testing_;
 
   // This provider is disabled when true.
   static bool disabled_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryQuickProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_QUICK_PROVIDER_H_