components: Cleanup class/struct fwd declarations

components/omnibox/browser/history_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 COMPONENTS_OMNIBOX_BROWSER_HISTORY_PROVIDER_H_
 #define COMPONENTS_OMNIBOX_BROWSER_HISTORY_PROVIDER_H_
 
 #include <stddef.h>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/omnibox/browser/autocomplete_provider.h"
 #include "components/omnibox/browser/autocomplete_provider_client.h"
 #include "components/omnibox/browser/in_memory_url_index_types.h"
 
 class AutocompleteInput;
-class Profile;
 struct AutocompleteMatch;
 
 // This class is a base class for the history autocomplete providers and
 // provides functions useful to all derived classes.
 class HistoryProvider : public AutocompleteProvider {
  public:
   void DeleteMatch(const AutocompleteMatch& match) override;
 
   // Returns true if inline autocompletion should be prevented for URL-like
   // input.  This method returns true if input.prevent_inline_autocomplete()
@@ skipping 18 matching lines @@
 
   AutocompleteProviderClient* client() { return client_; }
 
  private:
   AutocompleteProviderClient* client_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryProvider);
 };
 
 #endif  // COMPONENTS_OMNIBOX_BROWSER_HISTORY_PROVIDER_H_