Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/autocomplete/shortcuts_provider.h

 // Copyright (c) 2011 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_SHORTCUTS_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_PROVIDER_H_
 #pragma once
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/time.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/autocomplete/history_provider.h"
 #include "chrome/browser/autocomplete/shortcuts_provider_shortcut.h"
 #include "chrome/browser/history/shortcuts_backend.h"
 
 class Profile;
-struct AutocompleteLog;
 
 // Provider of recently autocompleted links. Provides autocomplete suggestions
 // from previously selected suggestions. The more often a user selects a
 // suggestion for a given search term the higher will be that suggestion's
 // ranking for future uses of that search term.
 class ShortcutsProvider
     : public AutocompleteProvider,
       public history::ShortcutsBackend::ShortcutsBackendObserver {
  public:
   ShortcutsProvider(ACProviderListener* listener, Profile* profile);
@@ skipping 57 matching lines @@
   // For unit-test only.
   void set_shortcuts_backend(history::ShortcutsBackend* shortcuts_backend);
 
   std::string languages_;
   bool initialized_;
 
   scoped_refptr<history::ShortcutsBackend> shortcuts_backend_;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SHORTCUTS_PROVIDER_H_