ui: Cleanup class/struct forward declarations

ui/views/animation/ink_drop_impl.h

 // Copyright 2015 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 UI_VIEWS_ANIMATION_INK_DROP_IMPL_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/views/animation/ink_drop.h"
 #include "ui/views/animation/ink_drop_highlight_observer.h"
 #include "ui/views/animation/ink_drop_ripple_observer.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 namespace test {
 class InkDropImplTestApi;
 }  // namespace test
 
 class InkDropRipple;
 class InkDropHost;
 class InkDropHighlight;
-class InkDropFactoryTest;
 
 // A functional implementation of an InkDrop.
 class VIEWS_EXPORT InkDropImpl : public InkDrop,
                                  public InkDropRippleObserver,
                                  public InkDropHighlightObserver {
  public:
   // The different auto highlight behaviors.
   enum class AutoHighlightMode {
     // No auto-highlighting is done. The highlight will only be shown/hidden as
     // per the hover/focus settings.
@@ skipping 267 matching lines @@
   // Used to ensure highlight state transitions are not triggered when exiting
   // the current state.
   bool exiting_highlight_state_;
 
   DISALLOW_COPY_AND_ASSIGN(InkDropImpl);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_IMPL_H_