chrome: Cleanup class/struct forward declarations

chrome/browser/ui/find_bar/find_bar_state.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.
 
 // Stores per-profile state needed for find in page.  This includes the most
 // recently searched for term.
 
 #ifndef CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_STATE_H_
 #define CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_STATE_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "components/keyed_service/core/keyed_service.h"
 
-class Profile;
-
 class FindBarState : public KeyedService {
  public:
   FindBarState() {}
   ~FindBarState() override {}
 
   base::string16 last_prepopulate_text() const {
     return last_prepopulate_text_;
   }
 
   void set_last_prepopulate_text(const base::string16& text) {
     last_prepopulate_text_ = text;
   }
 
  private:
   base::string16 last_prepopulate_text_;
 
   DISALLOW_COPY_AND_ASSIGN(FindBarState);
 };
 
 #endif  // CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_STATE_H_