chrome: Cleanup class/struct forward declarations

chrome/browser/ui/find_bar/find_tab_helper.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_UI_FIND_BAR_FIND_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_FIND_BAR_FIND_TAB_HELPER_H_
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
 #include "chrome/browser/ui/find_bar/find_notification_details.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "ui/gfx/range/range.h"
 
-namespace gfx {
-class RectF;
-}
-
 // Per-tab find manager. Handles dealing with the life cycle of find sessions.
 class FindTabHelper : public content::WebContentsObserver,
                       public content::WebContentsUserData<FindTabHelper> {
  public:
   ~FindTabHelper() override;
 
   // Starts the Find operation by calling StartFinding on the Tab. This function
   // can be called from the outside as a result of hot-keys, so it uses the
   // last remembered search string as specified with set_find_string(). This
   // function does not block while a search is in progress. The controller will
@@ skipping 102 matching lines @@
 
   // The last find result. This object contains details about the number of
   // matches, the find selection rectangle, etc. The UI can access this
   // information to build its presentation.
   FindNotificationDetails last_search_result_;
 
   DISALLOW_COPY_AND_ASSIGN(FindTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_FIND_BAR_FIND_TAB_HELPER_H_