chrome: Cleanup class/struct forward declarations

chrome/browser/ui/views/autofill/autofill_popup_base_view.h

 // Copyright 2014 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_VIEWS_AUTOFILL_AUTOFILL_POPUP_BASE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_AUTOFILL_AUTOFILL_POPUP_BASE_VIEW_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "chrome/browser/ui/autofill/autofill_popup_view_delegate.h"
 #include "ui/views/focus/widget_focus_manager.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/widget/widget_observer.h"
 
-namespace content {
-class WebContents;
-}
-
 namespace gfx {
 class Point;
 }
 
 namespace autofill {
 
 // Class that deals with the event handling for Autofill-style popups. This
 // class should only be instantiated by sub-classes.
 class AutofillPopupBaseView : public views::WidgetDelegateView,
                               public views::WidgetFocusChangeListener,
@@ skipping 56 matching lines @@
   base::Time show_time_;
 
   base::WeakPtrFactory<AutofillPopupBaseView> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillPopupBaseView);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_VIEWS_AUTOFILL_AUTOFILL_POPUP_BASE_VIEW_H_